Bug 586814

Summary:	kde-plasma/kdm: freezes when trying to change expired password
Product:	Gentoo Linux	Reporter:	JY <jy454>
Component:	Current packages	Assignee:	Gentoo KDE team <kde>
Status:	RESOLVED WONTFIX
Severity:	normal	CC:	itumaykin+gentoo
Priority:	Normal	Keywords:	PATCH
Version:	unspecified
Hardware:	All
OS:	Linux
URL:	https://bugzilla.redhat.com/show_bug.cgi?id=906865
Whiteboard:	removed on 2017/02/20
Package list:		Runtime testing required:	---
Attachments:	patch for the cancel button issue patch for the timer freeze issue

Description JY 2016-06-23 15:34:49 UTC

KDM (version 4.11.14) using default classic greeter has multiples bugs related to 
changing password using pam_chauthtok and various pam configuration 
Because KDM development in stopped and sddm does not have enough features yet, I've been forced to write some patches. 

Using pam_cracklib with retry=3 option :

Step to reproduce 
* add UNIX user foobar
* set password for user foobar with passwd
* Force foobar's password to expire with chage -d 0 foobar
* Try to login with KDM as foobar
* KDM tells you have to change password
* Click on the "Cancel" button to cancel the password change
* Try to do a normal login again

Result :
* KDM display msgbox relating to the previously  cancelled password procedure

Expected :
* PAM procedure being properly ended and new procedure 

What happens is that pam_cracklib continues to ask for password after the first PAM_CONV_ERR returned by KDM, the greeter thinks PAM has ended but the core is still in the pam_cracklib loop.


Reproductible : always with pam_cracklib retry=3

2nd bug is from https://bugzilla.redhat.com/show_bug.cgi?id=906865 reproduced only in LDAP environment.

The fedora analysis is good, seems like in LDAP auth context, the timer which normally resets KDM greeter after 40s inactivity is never stopped. After trying to debug the deadlock, I've resigned myself to patch the greeter to stop the timer when we enter a chauthtok sequence.

I've also found this bug : https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/641712

Proposed resolution in kdmrc works for me

Comment 1 JY 2016-06-23 15:35:50 UTC

Created attachment 438554 [details, diff]
patch for the cancel button issue

Comment 2 JY 2016-06-23 15:36:40 UTC

Created attachment 438556 [details, diff]
patch for the timer freeze issue

Comment 3 Johannes Huber (RETIRED) gentoo-dev

2017-02-20 19:05:02 UTC

Plasma 4 removed from tree.

https://gitweb.gentoo.org/repo/gentoo.git/commit/?id=b2fa0ea91a6726f62e98e5d8b93937d63dca1a80