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Full Discussion: PAM configuration: Kerberos authentication and NIS authorization problem
Operating Systems Linux Red Hat PAM configuration: Kerberos authentication and NIS authorization problem Post 302386263 by geek.ksa on Tuesday 12th of January 2010 02:53:06 AM
Old 01-12-2010
PAM configuration: Kerberos authentication and NIS authorization problem
Hi,

I've configured two linux boxes to authenticate against Windows Active Directory using Kerberos while retrieving authorization data (uids, gids ,,,)from NIS.

The problem I ran into with my PAM configuration is that all authentication attempts succeed in order.i.e. if someone tried his NIS credentials he will be granted access!!

What I want is this: Kerberos authentication is tried first; if it fails, local files authentication ONLY is tried.

here's my PAM configuration from system-auth pam configuration file which is included by all systems pam-aware services:

Code:
auth        required      pam_env.so
auth        sufficient    pam_krb5.so debug
auth        sufficient    pam_unix.so nullok try_first_pass
auth        requisite     pam_succeed_if.so uid >= 500 quiet
auth        required      pam_deny.so

The issue here: I think the pam_unix module somehow contacts NIS for authentication if Kerberos fails. But, I had updated my sswitch.conf to look like:

Code:
passwd:     files nis
shadow:     files
group:      files nis

I thought the pam_unix.so module references this file to see where to look up passwords.

Please note that I can't remove nis form passwd and group sections because this is needed to get authorization (uid,gid) data from NIS.

The point is, above nsswitch.conf didn't resolve the issue, users are still able to log in using their NIS credentials!

Please help me figure out what is wrong here.
 

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LEARN ABOUT CENTOS

fingerprint-auth-ac

SYSTEM-AUTH-AC(5)						File Formats Manual						 SYSTEM-AUTH-AC(5)

NAME

       system-auth-ac,	password-auth-ac,  smartcard-auth-ac, fingerprint-auth-ac, postlogin-ac - Common configuration files for PAMified services
       written by authconfig(8)

SYNOPSIS

       /etc/pam.d/system-auth-ac

DESCRIPTION

       The purpose of this configuration file is to provide common configuration file  for  all  applications  and  service  daemons  calling  PAM
       library.

       The system-auth configuration file is included from all individual service configuration files with the help of the include directive. When
       authconfig(8) writes the system PAM configuration file it replaces the default system-auth file with a symlink pointing	to  system-auth-ac
       and writes the configuration to this file. The symlink is not changed on subsequent configuration changes even if it points elsewhere. This
       allows system administrators to override the configuration written by authconfig.

       The  authconfig	now  writes  the  authentication  modules  also  into  additional  PAM	configuration  files  /etc/pam.d/password-auth-ac,
       /etc/pam.d/smartcard-auth-ac, and /etc/pam.d/fingerprint-auth-ac.  These configuration files contain only modules which perform authentica-
       tion with the respective kinds of authentication tokens.  For example /etc/pam.d/smartcard-auth[-ac] will not contain pam_unix and pam_ldap
       modules and /etc/pam.d/password-auth[-ac] will not contain pam_pkcs11 and pam_fprintd modules.

       The  file  /etc/pam.d/postlogin-ac  contains  common services to be invoked after login. An example can be a module that encrypts an user's
       filesystem or user's keyring and is decrypted by his password.

       The PAM configuration files of services which are accessed by remote connections such as sshd or ftpd now include the  /etc/pam.d/password-
       auth configuration file instead of /etc/pam.d/system-auth.

EXAMPLE

       Configure  system  to  use  pam_tally2  for  configuration  of maximum number of failed logins. Also call pam_access to verify if access is
       allowed.

       Make system-auth symlink point to system-auth-local which contains:

       auth	       requisite       pam_access.so
       auth	       requisite       pam_tally2.so deny=3 lock_time=30 
					     unlock_time=3600
       auth	       include	       system-auth-ac
       account	       required        pam_tally2.so
       account	       include	       system-auth-ac
       password        include	       system-auth-ac
       session	       include	       system-auth-ac

BUGS

       None known.

SEE ALSO

       authconfig(8), authconfig-gtk(8), pam(8), system-auth(5)

Red Hat, Inc.							   2010 March 31						 SYSTEM-AUTH-AC(5)
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