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Bug 57532

Summary: pam_cracklib not seeing old password when chained with pam_ldap
Product: [Retired] Red Hat Linux Reporter: John Dalbec <jpdalbec>
Component: nss_ldapAssignee: Nalin Dahyabhai <nalin>
Status: CLOSED ERRATA QA Contact: Aaron Brown <abrown>
Severity: medium Docs Contact:
Priority: medium    
Version: 7.2   
Target Milestone: ---   
Target Release: ---   
Hardware: i686   
OS: Linux   
Whiteboard:
Fixed In Version: Doc Type: Bug Fix
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Clone Of: Environment:
Last Closed: 2001-12-19 19:09:37 UTC Type: ---
Regression: --- Mount Type: ---
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Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description Flags
patch to set PAM_OLDAUTHTOK item during prelim check none

Description John Dalbec 2001-12-14 22:44:02 UTC 
From Bugzilla Helper:
User-Agent: Mozilla/4.77 [en] (X11; U; Linux 2.4.9-12 i686)

Description of problem:
This is a bad interaction between several components.  The "passwd" program
calls pam_chauthtok().  On PAM_PRELIM_CHECK, pam_cracklib's
pam_sm_chauthtok() does (essentially) nothing.  Then pam_ldap's
pam_sm_chauthtok() gets the old password and stores it in
PADL_LDAP_AUTHTOK_DATA with pam_set_data() (but not in PAM_OLDAUTHTOK with
pam_set_item()).  Now pam_cracklib gets control again for the update, but
it's looking for the old password in PAM_OLDAUTHTOK with pam_get_item() and
can't find it.  This disables certain checks such as simple().

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. Define an LDAP account.
2. As the LDAP user, change its password.
3. Enter 'qwerty' at the 'New UNIX password:' prompt.
	

Actual Results:  Retype new UNIX password:

Expected Results:  BAD PASSWORD: is too simple

Additional info:

pam_ldap.h:#define PADL_LDAP_OLDAUTHTOK_DATA "PADL-LDAP-OLDAUTHTOK-DATA"
pam_modules.h:#define PAM_OLDAUTHTOK  7	/* The old authentication token */

This could be fixed by setting the PAM_OLDAUTHTOK item in pam_ldap or by
changing pam_cracklib to retrieve a current password and save it in
PAM_OLDAUTHTOK when not running as root.
Comment 1 John Dalbec 2001-12-18 21:57:35 UTC 
Created attachment 40968 [details]
patch to set PAM_OLDAUTHTOK item during prelim check
Comment 2 John Dalbec 2001-12-19 19:09:32 UTC 
The patch I attached includes my fix for bug #56201.