718250 – Remove DENY rules from the HBAC access provider

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Bug 718250 - Remove DENY rules from the HBAC access provider

Summary: Remove DENY rules from the HBAC access provider

Keywords:
Status:	CLOSED ERRATA
Alias:	None
Product:	Red Hat Enterprise Linux 6
Classification:	Red Hat
Component:	sssd
Sub Component:
Version:	6.1
Hardware:	Unspecified
OS:	Unspecified
Priority:	high
Severity:	unspecified
Target Milestone:	rc
Target Release:	---
Assignee:	Stephen Gallagher
QA Contact:	Chandrasekar Kannan
Docs Contact:
URL:
Whiteboard:
Depends On:
Blocks:	748854
TreeView+	depends on / blocked

Reported:	2011-07-01 15:05 UTC by Stephen Gallagher
Modified:	2020-05-02 16:23 UTC (History)
CC List:	6 users (show)
Fixed In Version:	sssd-1.5.1-46.el6
Doc Type:	Bug Fix
Doc Text:	Cause: The IPA server deprecated DENY rules of the Host Based Access Control provider Consequence: The SSSD client needs a way to deal with DENY rules that are already in the wild Fix: A new option ipa_hbac_treat_deny_as was added. It defaults to DENY_ALL which means that any DENY rule in the whole ruleset would deny access no matter what the actual rule is. The other option is to set it to IGNORE which would make SSSD just skip the DENY rules. Result: The HBAC access provider was updated to reflect server-side IPA changes. It should be noted that the IGNORE setting is potentially dangerous as it, by ignoring the DENY rules altogether, may allow access to users who are not intended to be allowed.
Clone Of:
Clones:	748854 (view as bug list)
Environment:
Last Closed:	2011-12-06 16:38:57 UTC
Target Upstream Version:
Embargoed:

Attachments	(Terms of Use)

Links
System	ID	Priority	Status	Summary	Last Updated
FedoraHosted SSSD	912	None	None	None	Never
FedoraHosted SSSD	913	None	None	None	Never
Github	SSSD sssd issues 1989	None	None	None	2020-05-02 16:23:15 UTC
Red Hat Product Errata	RHBA-2011:1529	normal	SHIPPED_LIVE	sssd bug fix and enhancement update	2011-12-06 00:50:20 UTC

Description Stephen Gallagher 2011-07-01 15:05:50 UTC

Description of problem:
https://www.redhat.com/archives/freeipa-users/2011-July/msg00002.html
https://fedorahosted.org/sssd/ticket/912
https://fedorahosted.org/sssd/ticket/913

Comment 2 Gowrishankar Rajaiyan 2011-10-03 15:03:12 UTC


Case 1:- for users with ipa_hbac_treat_deny_as = DENY_ALL
Server: 
# ipa hbacrule-find rule1
-------------------
1 HBAC rule matched
-------------------
  Rule name: rule1
  Rule type: deny
  Enabled: TRUE
  Users: shanks
  Hosts: ironhide.lab.eng.pnq.redhat.com
  Source hosts: kungfupanda.lab.eng.pnq.redhat.com, ironhide.lab.eng.pnq.redhat.com

Client:
[domain/lab.eng.pnq.redhat.com]
cache_credentials = True
krb5_store_password_if_offline = True
ipa_domain = lab.eng.pnq.redhat.com
id_provider = ipa
auth_provider = ipa
access_provider = ipa
chpass_provider = ipa
ipa_server = _srv_, kungfupanda.lab.eng.pnq.redhat.com
ldap_tls_cacert = /etc/ipa/ca.crt
debug_level = 9

[root@ironhide ~]# ssh -l shanks $HOSTNAME
shanks.eng.pnq.redhat.com's password: 
Connection closed by 10.65.201.65
[root@ironhide ~]# 

[root@ironhide ~]# ssh -l shanks2 $HOSTNAME
shanks2.eng.pnq.redhat.com's password: 
Connection closed by 10.65.201.65
[root@ironhide ~]# 


Case 2:- for users with ipa_hbac_treat_deny_as = IGNORE
Server: 
# ipa hbacrule-find rule1
-------------------
1 HBAC rule matched
-------------------
  Rule name: rule1
  Rule type: deny
  Enabled: TRUE
  Users: shanks
  Hosts: ironhide.lab.eng.pnq.redhat.com
  Source hosts: kungfupanda.lab.eng.pnq.redhat.com, ironhide.lab.eng.pnq.redhat.com

Client:
[domain/lab.eng.pnq.redhat.com]
cache_credentials = True
krb5_store_password_if_offline = True
ipa_domain = lab.eng.pnq.redhat.com
id_provider = ipa
auth_provider = ipa
access_provider = ipa
chpass_provider = ipa
ipa_server = _srv_, kungfupanda.lab.eng.pnq.redhat.com
ldap_tls_cacert = /etc/ipa/ca.crt
debug_level = 9
ipa_hbac_treat_deny_as = ignore

[root@ironhide ~]# ssh -l shanks $HOSTNAME
shanks.eng.pnq.redhat.com's password: 
Last login: Mon Oct  3 10:52:45 2011 from ironhide.lab.eng.pnq.redhat.com
-sh-4.1$ 

Case 3:- for groups with ipa_hbac_treat_deny_as = DENY_ALL
Server:
# ipa hbacrule-find rule1
-------------------
1 HBAC rule matched
-------------------
  Rule name: rule1
  Rule type: deny
  Enabled: TRUE
  Groups: ipausers
  Hosts: ironhide.lab.eng.pnq.redhat.com
  Source hosts: ironhide.lab.eng.pnq.redhat.com, kungfupanda.lab.eng.pnq.redhat.com

# ipa group-show ipausers
  Group name: ipausers
  Description: Default group for all users
  GID: 1116200001
  Member users: shanks, shanks2

# ipa user-show shanks3
  User login: shanks3
  First name: s
  Last name: 3
  Home directory: /home/shanks3
  Login shell: /bin/sh
  Account disabled: False

Client:
[domain/lab.eng.pnq.redhat.com]
cache_credentials = True
krb5_store_password_if_offline = True
ipa_domain = lab.eng.pnq.redhat.com
id_provider = ipa
auth_provider = ipa
access_provider = ipa
chpass_provider = ipa
ipa_server = _srv_, kungfupanda.lab.eng.pnq.redhat.com
ldap_tls_cacert = /etc/ipa/ca.crt
debug_level = 9

[root@ironhide ~]# ssh -l shanks $HOSTNAME
shanks.eng.pnq.redhat.com's password: 
Connection closed by 10.65.201.65

[root@ironhide ~]# ssh -l shanks2 $HOSTNAME
shanks2.eng.pnq.redhat.com's password: 
Connection closed by 10.65.201.65

[root@ironhide ~]# ssh -l shanks3 $HOSTNAME
shanks3.eng.pnq.redhat.com's password: 
Connection closed by 10.65.201.65

Case 4:- for groups with ipa_hbac_treat_deny_as = IGNORE
Server:
# ipa hbacrule-find rule1
-------------------
1 HBAC rule matched
-------------------
  Rule name: rule1
  Rule type: deny
  Enabled: TRUE
  Groups: ipausers
  Hosts: ironhide.lab.eng.pnq.redhat.com
  Source hosts: ironhide.lab.eng.pnq.redhat.com, kungfupanda.lab.eng.pnq.redhat.com

Client:
[domain/lab.eng.pnq.redhat.com]
cache_credentials = True
krb5_store_password_if_offline = True
ipa_domain = lab.eng.pnq.redhat.com
id_provider = ipa
auth_provider = ipa
access_provider = ipa
chpass_provider = ipa
ipa_server = _srv_, kungfupanda.lab.eng.pnq.redhat.com
ldap_tls_cacert = /etc/ipa/ca.crt
debug_level = 9
ipa_hbac_treat_deny_as = ignore

[root@ironhide ~]# ssh -l shanks3 $HOSTNAME
shanks3.eng.pnq.redhat.com's password: 
Last login: Mon Oct  3 10:59:03 2011 from ironhide.lab.eng.pnq.redhat.com

[root@ironhide ~]# ssh -l shanks $HOSTNAME
shanks.eng.pnq.redhat.com's password: 
Last login: Mon Oct  3 10:52:50 2011 from ironhide.lab.eng.pnq.redhat.com


and in domain logs when denied:
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_attrs_to_rule] (7): Processing rule [allow_all]
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_user_attrs_to_rule] (7): Processing users for rule [allow_all]
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_get_category] (5): Category is set to 'all'.
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_service_attrs_to_rule] (7): Processing PAM services for rule [allow_all]
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_get_category] (5): Category is set to 'all'.
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_thost_attrs_to_rule] (7): Processing target hosts for rule [allow_all]
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_get_category] (5): Category is set to 'all'.
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_shost_attrs_to_rule] (7): Processing source hosts for rule [allow_all]
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_get_category] (5): Category is set to 'all'.
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_attrs_to_rule] (7): Processing rule [rule1]
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [hbac_attrs_to_rule] (7): Rule [rule1] is not an ALLOW rule
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [ipa_hbac_evaluate_rules] (1): DENY rules detected. Denying access to all users
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [sdap_id_op_destroy] (9): releasing operation connection
(Mon Oct  3 10:57:43 2011) [sssd[be[lab.eng.pnq.redhat.com]]] [be_pam_handler_callback] (4): Backend returned: (0, 6, <NULL>) [Success]


Verified.
ipa-server-2.0.0-23.el6.x86_64
sssd-1.5.1-53.el6.i686

Comment 3 Jakub Hrozek 2011-10-27 15:52:56 UTC

    Technical note added. If any revisions are required, please edit the "Technical Notes" field
    accordingly. All revisions will be proofread by the Engineering Content Services team.
    
    New Contents:
Cause: The IPA server deprecated DENY rules of the Host Based Access Control provider
Consequence: The SSSD client needs a way to deal with DENY rules that are already in the wild
Fix: A new option ipa_hbac_treat_deny_as was added. It defaults to DENY_ALL which means that any DENY rule in the whole ruleset would deny access no matter what the actual rule is. The other option is to set it to IGNORE which would make SSSD just skip the DENY rules.
Result: The HBAC access provider was updated to reflect server-side IPA changes. It should be noted that the IGNORE setting is potentially dangerous as it, by ignoring the DENY rules altogether, may allow access to users who are not intended to be allowed.

Comment 4 errata-xmlrpc 2011-12-06 16:38:57 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, and where to find the updated
files, follow the link below.

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

http://rhn.redhat.com/errata/RHBA-2011-1529.html

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