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ldap and PAM Authentication

To: openldap-software@OpenLDAP.org
Subject: ldap and PAM Authentication
From: Amir Bukhari <ufz6@rz.uni-karlsruhe.de>
Date: Sun, 24 Nov 2002 23:20:27 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.0.1) Gecko/20020826

Hello, I plan to use my ldap server as authentication server for my network. I have debian 3 and have installed pam-ldap and nss-pam and evering thing gone very good ( ssh , rsh , rlogin ..) , but there is srtange things : 1- the users, who I have registered in ldap server, can not execute xterm or any windows manager, they can for example run xman :-\ . 2- in the prompt it look so for them: I have no name!@c39a:~$ it seem the prompt can not find the user name, but $LOGNAME and $UID have the correct values 3- the ssh client program they can not used it, because it said : # I have no name!@c39a:~$ ssh rzstud.rz.uni-karlsruhe.de #You don't exist, go away! ----------- Note that they can logon and change their passoword without problem. I don't understad :-[ .

Amir

configuration files:
PAM_LDAP.CONF
###DEBCONF###
# the configuration of this file will be done by debconf as long as the
# first line of the file says '###DEBCONF###'
#
# you should use dpkg-reconfigure to configure this file
#
# @(#)$Id: ldap.conf,v 1.24 2001/09/20 14:12:26 lukeh Exp $
#
# This is the configuration file for the LDAP nameservice
# switch library and the LDAP PAM module.
#
# PADL Software
# http://www.padl.com
#

# Your LDAP server. Must be resolvable without using LDAP.
host 127.0.0.1

# The distinguished name of the search base.
base dc=bukhari,dc=de

# Another way to specify your LDAP server is to provide an # uri with the server name. This allows to use # Unix Domain Sockets to connect to a local LDAP Server. #uri ldap://127.0.0.1/ #uri ldaps://127.0.0.1/ #uri ldapi://%2fvar%2frun%2fldapi_sock/ # Note: %2f encodes the '/' used as directory separator

# The LDAP version to use (defaults to 3
# if supported by client library)
ldap_version 3

# The distinguished name to bind to the server with.
# Optional: default is to bind anonymously.
#binddn cn=Admin,dc=bukhari,dc=de

# The credentials to bind with.
# Optional: default is no credential.
#bindpw secret

# The distinguished name to bind to the server with
# if the effective user ID is root. Password is
# stored in /etc/ldap.secret (mode 600)
rootbinddn cn=Admin,dc=bukhari,dc=de

# The port.
# Optional: default is 389.
#port 389

# The search scope.
scope sub
#scope one
#scope base

# Search timelimit
#timelimit 30

# Bind timelimit
#bind_timelimit 30

# Filter to AND with uid=%s
pam_filter objectclass=posixAccount,account

# The user ID attribute (defaults to uid)
pam_login_attribute uid

# Search the root DSE for the password policy (works
# with Netscape Directory Server)
#pam_lookup_policy yes

# Check the 'host' attribute for access control
# Default is no; if set to yes, and user has no
# value for the host attribute, and pam_ldap is
# configured for account management (authorization)
# then the user will not be allowed to login.
#pam_check_host_attr yes

# Group to enforce membership of
#pam_groupdn cn=PAM,ou=Groups,dc=example,dc=net

# Group member attribute
#pam_member_attribute uniquemember

# Specify a minium or maximum UID number allowed
#pam_min_uid 0
#pam_max_uid 0

# Template login attribute, default template user
# (can be overriden by value of former attribute
# in user's entry)
#pam_login_attribute userPrincipalName
#pam_login_attribute uid
pam_template_login_attribute uid
#pam_template_login nobody

# HEADS UP: the pam_crypt, pam_nds_passwd,
# and pam_ad_passwd options are no
# longer supported.

# Do not hash the password at all; presume
# the directory server will do it, if
# necessary. This is the default.
pam_password crypt

# Hash password locally; required for University of
# Michigan LDAP server, and works with Netscape
# Directory Server if you're using the UNIX-Crypt
# hash mechanism and not using the NT Synchronization
# service.
#pam_password crypt

# Remove old password first, then update in
# cleartext. Necessary for use with Novell
# Directory Services (NDS)
#pam_password nds

# Update Active Directory password, by
# creating Unicode password and updating
# unicodePwd attribute.
#pam_password ad

# Use the OpenLDAP password change
# extended operation to update the password.
#pam_password exop

# configure --enable-mssfu-schema is no longer supported.
# For MSSFU now do:
#pam_login_attribute msSFUName
#pam_filter objectclass=User
#pam_password ad

# configure --enable-authpassword is no longer supported
# For authPassword support, now do:
#pam_password nds

# For IBM SecureWay support, do:
#pam_login_attribute userName
#pam_filter objectclass=aixAccount
#pam_password clear

----------------------------------------

NSSWITCH.CONF

# /etc/nsswitch.conf
#
# Example configuration of GNU Name Service Switch functionality.
# If you have the `glibc-doc' and `info' packages installed, try:
# `info libc "Name Service Switch"' for information about this file.

passwd: ldap files group: ldap files shadow: ldap files

hosts:          files dns
networks:       files

protocols:      db files ldap
services:       db files ldap
ethers:         db files ldap
rpc:            db files ldap

netgroup:       nis

---------------

LIBNSS-LDAP.CONF
###DEBCONF###
# the configuration of this file will be done by debconf as long as the
# first line of the file says '###DEBCONF###'
#
# you should use dpkg-reconfigure libnss-ldap to configure this file.
#
# @(#)$Id: ldap.conf,v 2.30 2001/09/22 10:57:56 lukeh Exp $
#
# This is the configuration file for the LDAP nameservice
# switch library and the LDAP PAM module.
#
# PADL Software
# http://www.padl.com
#

# Your LDAP server. Must be resolvable without using LDAP.
host 127.0.0.1

# The distinguished name of the search base.
base dc=bukhari,dc=de
#base ou=users,dc=bukhari,dc=de

# Another way to specify your LDAP server is to provide an # uri with the server name. This allows to use # Unix Domain Sockets to connect to a local LDAP Server. uri ldap://127.0.0.1/ #uri ldaps://127.0.0.1/ #uri ldapi://%2fvar%2frun%2fldapi_sock/ # Note: %2f encodes the '/' used as directory separator

# The LDAP version to use (defaults to 3
# if supported by client library)
ldap_version 3

# The distinguished name to bind to the server with.
# Optional: default is to bind anonymously.
#binddn cn=proxyuser,dc=padl,dc=com

# The credentials to bind with.
# Optional: default is no credential.
#bindpw secret

# The distinguished name to bind to the server with
# if the effective user ID is root. Password is
# stored in /etc/ldap.secret (mode 600)
#rootbinddn cn=manager,dc=padl,dc=com

# The port.
# Optional: default is 389.
#port 389

# The search scope.
scope sub
#scope one
#scope base

# Search timelimit
#timelimit 30

# Bind timelimit
#bind_timelimit 30

# Idle timelimit; client will close connections
# (nss_ldap only) if the server has not been contacted
# for the number of seconds specified below.
#idle_timelimit 3600

# RFC2307bis naming contexts # Syntax: # nss_base_XXX base?scope?filter # where scope is {base,one,sub} # and filter is a filter to be &'d with the # default filter. # You can omit the suffix eg: # nss_base_passwd ou=People, # to append the default base DN but this # may incur a small performance impact. nss_base_passwd ou=users,dc=bukhari,dc=de nss_base_shadow ou=users,dc=bukhari,dc=de nss_base_group ou=groups,dc=bukhari,dc=de #nss_base_hosts ou=Hosts,dc=padl,dc=com?one #nss_base_services ou=Services,dc=padl,dc=com?one #nss_base_networks ou=Networks,dc=padl,dc=com?one #nss_base_protocols ou=Protocols,dc=padl,dc=com?one #nss_base_rpc ou=Rpc,dc=padl,dc=com?one #nss_base_ethers ou=Ethers,dc=padl,dc=com?one #nss_base_netmasks ou=Networks,dc=padl,dc=com?ne #nss_base_bootparams ou=Ethers,dc=padl,dc=com?one #nss_base_aliases ou=Aliases,dc=padl,dc=com?one #nss_base_netgroup ou=Netgroup,dc=padl,dc=com?one

# attribute/objectclass mapping
# Syntax:
#nss_map_attribute    rfc2307attribute    mapped_attribute
#nss_map_objectclass    rfc2307objectclass    mapped_objectclass

# configure --enable-nds is no longer supported.
# For NDS now do:
#nss_map_attribute uniqueMember member

# configure --enable-mssfu-schema is no longer supported.
# For MSSFU now do:
#nss_map_objectclass posixAccount User
#nss_map_attribute uid msSFUName
#nss_map_attribute uniqueMember posixMember
#nss_map_attribute userPassword msSFUPassword
#nss_map_attribute homeDirectory msSFUHomeDirectory
#nss_map_objectclass posixGroup Group
#nss_map_attribute cn msSFUName

# Alternatively, if you wish to equivalence W2K and POSIX
# groups, change the uniqueMember mapping line to:
#nss_map_attribute uniqueMember member

# configure --enable-authpassword is no longer supported
# For authPassword support, now do:
#nss_map_attribute userPassword authPassword

# For IBM AIX SecureWay support, do:
#nss_map_objectclass posixAccount aixAccount
#nss_base_passwd ou=aixaccount,?one
#nss_map_attribute uid userName
#nss_map_attribute gidNumber gid
#nss_map_attribute uidNumber uid
#nss_map_attribute userPassword passwordChar
#nss_map_objectclass posixGroup aixAccessGroup
#nss_base_group ou=aixgroup,?one
#nss_map_attribute cn groupName
#nss_map_attribute uniqueMember member
------------------------------------------------------
examples for pam.d/*
LOGIN
# Disallows root logins except on tty's listed in /etc/securetty
# (Replaces the `CONSOLE' setting from login.defs)
auth       requisite  pam_securetty.so
#auth     sufficient     pam_ldap.so
auth     required        pam_unix_auth.so try_first_pass

## ldap pam


# Disallows other than root logins when /etc/nologin exists
# (Replaces the `NOLOGINS_FILE' option from login.defs)
auth       requisite  pam_nologin.so

# This module parses /etc/environment (the standard for setting
# environ vars) and also allows you to use an extended config
# file /etc/security/pam_env.conf.
# (Replaces the `ENVIRON_FILE' setting from login.defs)
auth       required   pam_env.so

# Standard Un*x authentication. The "nullok" line allows passwordless
# accounts.
#auth       required   pam_unix.so nullok

# This allows certain extra groups to be granted to a user
# based on things like time of day, tty, service, and user.
# Please uncomment and edit /etc/security/group.conf if you
# wish to use this.
# (Replaces the `CONSOLE_GROUPS' option in login.defs)
# auth       optional   pam_group.so

# Uncomment and edit /etc/security/time.conf if you need to set
# time restrainst on logins.
# (Replaces the `PORTTIME_CHECKS_ENAB' option from login.defs
# as well as /etc/porttime)
# account    requisite  pam_time.so

# Uncomment and edit /etc/security/access.conf if you need to
# set access limits.
# (Replaces /etc/login.access file)
# account  required       pam_access.so

# Standard Un*x account and session
account    required   pam_unix_acct.so
session    required   pam_unix_session.so

##ldap pam
#account  sufficient     pam_ldap.so
#session  sufficient     pam_ldap.so

# Sets up user limits, please uncomment and read /etc/security/limits.conf
# to enable this functionality.
# (Replaces the use of /etc/limits in old login)
# session    required   pam_limits.so

# Prints the last login info upon succesful login
# (Replaces the `LASTLOG_ENAB' option from login.defs)
session    optional   pam_lastlog.so

# Prints the motd upon succesful login
# (Replaces the `MOTD_FILE' option in login.defs)
session    optional   pam_motd.so

# Prints the status of the user's mailbox upon succesful login
# (Replaces the `MAIL_CHECK_ENAB' option from login.defs). You
# can also enable a MAIL environment variable from here, but it
# is better handled by /etc/login.defs, since userdel also uses
# it to make sure that removing a user, also removes their mail
# spool file.
session    optional   pam_mail.so standard noenv

# The standard Unix authentication modules, used with NIS (man nsswitch) as
# well as normal /etc/passwd and /etc/shadow entries. For the login service,
# this is only used when the password expires and must be changed, so make
# sure this one and the one in /etc/pam.d/passwd are the same. The "nullok"
# option allows users to change an empty password, else empty passwords are
# treated as locked accounts.
#
# (Add `md5' after the module name to enable MD5 passwords the same way that
# `MD5_CRYPT_ENAB' would do under login.defs).
#
# The "obscure" option replaces the old `OBSCURE_CHECKS_ENAB' option in
# login.defs. Also the "min" and "max" options enforce the length of the
# new password.

password required pam_unix_password.so try_first_pass nullok obscure min=4 max=8

# Alternate strength checking for password. Note that this
# requires the libpam-cracklib package to be installed.
# You will need to comment out the password line above and
# uncomment the next two in order to use this.
# (Replaces the `OBSCURE_CHECKS_ENAB', `CRACKLIB_DICTPATH')
#
# password required       pam_cracklib.so retry=3 minlen=6 difok=3
# password required       pam_unix.so use_authtok nullok md5

Follow-Ups:
- Re: ldap and PAM Authentication
  - From: Tony Earnshaw <tonni@billy.demon.nl>

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