[Bug 971248] [NEW] pam_ldap passwd entry when using kerberos

[Brian J. Murrell]

Public bug reported:

I have both libpam-ldap and libpam-krb5 installed because I am using
Kerberos for authentication here.  The implication is that I am not
using passwords in ldap.

When I try to change my password I get this in the auth.log:


Apr  1 23:21:30 foo passwd[4927]: pam_unix(passwd:chauthtok): user "brian" does not exist in /etc/passwd
Apr  1 23:21:38 foo passwd[4927]: pam_krb5(passwd:chauthtok): user brian changed Kerberos password
Apr  1 23:21:38 foo passwd[4927]: pam_unix(passwd:chauthtok): user "brian" does not exist in /etc/passwd
Apr  1 23:21:38 foo passwd[4927]: pam_ldap: ldap_modify_s Insufficient access

The tty where I changed my password shows:

$ passwd
Current Kerberos password: 
Enter new Kerberos password: 
Retype new Kerberos password: 
LDAP password information update failed: Insufficient access
passwd: Permission denied
passwd: password unchanged

Presumably this is all because PAM is trying to manipulate passwords in
LDAP but they just don't/shouldn't exist there.

My /etc/pam.d/common-passwd looks like this:

# here are the per-package modules (the "Primary" block)
password	requisite			pam_krb5.so minimum_uid=1000
password	[success=2 default=ignore]	pam_unix.so obscure use_authtok try_first_pass sha512
password	[success=1 user_unknown=ignore default=die]	pam_ldap.so use_authtok try_first_pass
# here's the fallback if no module succeeds
password	requisite			pam_deny.so
# prime the stack with a positive return value if there isn't one already;
# this avoids us returning an error just because nothing sets a success code
# since the modules above will each just jump around
password	required			pam_permit.so
# and here are more per-package modules (the "Additional" block)
password	optional	pam_gnome_keyring.so 
password	optional	pam_ecryptfs.so 
# end of pam-auth-update config

Does the configuration need to allow for whatever failure is causing the
"ldap_modify_s Insufficient access" in the case where LDAP is not being
used for authentication?

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: libpam-ldap 184-8.4ubuntu1
ProcVersionSignature: Ubuntu 2.6.38-13.56-generic 2.6.38.8
Uname: Linux 2.6.38-13-generic i686
Architecture: i386
Date: Sun Apr  1 23:37:37 2012
ProcEnviron:
 LANGUAGE=en_CA:en
 PATH=(custom, no user)
 LANG=en_CA
 LC_MESSAGES=en_CA.UTF-8
 SHELL=/bin/bash
SourcePackage: libpam-ldap
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: libpam-ldap (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 natty

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https://bugs.launchpad.net/bugs/971248

Title:
  pam_ldap passwd entry when using kerberos

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