Bug 1318515

Summary:	[Azure][RHEL 6.7][Need review for implementing password policy for on-demand images]
Product:	Red Hat Enterprise Linux 6	Reporter:	lizzha
Component:	pam	Assignee:	Tomas Mraz <tmraz>
Status:	CLOSED NOTABUG	QA Contact:	BaseOS QE Security Team <qe-baseos-security>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.7	CC:	jboutaud, pkis, stephen.zarkos
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-03-17 09:14:36 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:

Description lizzha 2016-03-17 06:43:42 UTC

We're going to implement password policy in the on-demand Azure RHEL images, to align with the password policy from Azure portal.

Here're the rules
- The password must be between 6-72 characters long.
- The password must contain 3 of the following:
  a lowercase character
  an uppercase character
  a number
  a special character 

We come out the below solution, could you please help review?

Modify following line in /etc/pam.d/system-auth:
password    requisite     pam_cracklib.so minlen=6 dcredit=1 ucredit=1 lcredit=1 ocredit=1 minclass=3 try_first_pass retry=3 type=

Comment 2 Tomas Mraz 2016-03-17 09:14:36 UTC

The proper line for what you want to achieve (of course without the maximum of 72 characters for which we do not have a checker) is:

password    requisite     pam_cracklib.so minlen=6 dcredit=0 ucredit=0 lcredit=0 ocredit=0 minclass=3 try_first_pass retry=3 type=

The credit values should be 0 because otherwise theoretically a password shorter than 6 characters could pass given the credit rules. However there is an additional unconditional check in cracklib that prevents passwords shorter than 6 characters anyway.

As I understand this bug was opened just for this review so I am closing it. If I misunderstood, please reopen.