LDAP

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LDAP

"The Lightweight Directory Access Protocol, or LDAP, is an application protocol for querying and modifying directory services running over TCP/IP." [Wiki: LDAP]

LDAP default port is 389. [1]

The default port for LDAP over SSL is 636 [2]

  • DN is Distinguished Name
  • RDN is Relative Distinguished Name
  • DC is domain component

An entry is defined as a set of attributes, and an attribute is a set of values, and sets need not be ordered.

LDAP Browsers

Java based LDAP Browser/Editor
http://www.mcs.anl.gov/~gawor/ldap/

JXplorer
http://www.jxplorer.org/

phpLDAPadmin - Web-based LDAP browser to manage your LDAP server
http://phpldapadmin.sourceforge.net/

Softerra LDAP Browser
http://www.softerra.com/download.htm

Ldapvi - Lets users update LDAP entries with a text editor
http://directory.fsf.org/database/applications/ldapvi.html

Tutorials

(My favorite) YoLinux LDAP Tutorial: Deploying OpenLDAP - Directory Installation and configuration (V1.2 / 2.x)
http://www.yolinux.com/TUTORIALS/LinuxTutorialLDAP.html

Introduction to LDAP
http://quark.humbug.org.au/publications/ldap/ldap_tut.html

The SLAPD and SLURPD Administrators Guide (University of Michigan)
http://www.umich.edu/~dirsvcs/ldap/doc/guides/slapd/

OpenLDAP Tutorial
http://www.acay.com.au/~oscarp/tutor/

LDAP Tutorial - Exercise with OpenLDAP v2.0.11 on Linux
http://www.ceenet.org/workshops/lectures2001/Peter%20Gietz/tutorial.html

SWiK Search for OpenLDAP tutorials
http://swik.net/OpenLDAP+Tutorial

LDAP-mini-HOWTO
http://www.grennan.com/ldap-HOWTO.html

OpenLDAP with Linux and Windows
http://www.linuxjournal.com/article/5689

LDAP for Rocket Scientists
http://www.zytrax.com/books/ldap/

Building an Address Book with OpenLDAP
http://www.onlamp.com/pub/a/onlamp/2003/03/27/ldap_ab.html

An Introduction to LDAP
http://www.onlamp.com/pub/a/onlamp/2001/08/16/ldap.html

Integrating LDAP and Kerberos: Part One (Kerberos)
http://www.linux-mag.com/microsites.php?site=linuxonblades&sid=main&p=4738

LDAP Authentication - LinuxWiki
http://linuxwiki.riverworth.com/index.php?title=LDAP_Authentication

Installation

CentOS 5 Installation

Install packages: 

yum install openldap openldap-clients openldap-servers

Edit configuration: 

vi /etc/openldap/slapd.conf

include         /etc/openldap/schema/core.schema
include         /etc/openldap/schema/cosine.schema
include         /etc/openldap/schema/inetorgperson.schema

pidfile         /var/run/openldap/slapd.pid
argsfile        /var/run/openldap/slapd.args

database        bdb
suffix          "o=t0e"
rootdn          "cn=Manager,o=t0e"
rootpw          test
directory       /var/lib/ldap/t0e
index           cn,sn,st  eq,pres,sub

Create directory: 

mkdir /var/lib/ldap/t0e
chown ldap.ldap /var/lib/ldap/t0e

Test configuration: 

slaptest

Start ldap service: 

service ldap restart
# slapd -d -1  # debug mode

Add entries: 

ldapadd -f MYFILE.ldif -xv -D "cn=Manager,o=t0e" -h 127.0.0.1 -w test
ldapadd -xv -D "cn=Manager,o=t0e" -h 127.0.0.1 -w test <<EOL

See all entries: 

ldapsearch -vLx -h 127.0.0.1 -b "o=stooges"
ldapsearch -vLx -h 127.0.0.1 -b "o=stooges" "(sn=Fine)"

Notes

The Berkely BDB database. The back-bdb is now the new preferred database format and the old back-ldbm code has been removed from OpenLDAP.

ldif example

dn: o=t0e
objectClass: top
objectClass: organization
o: t0e
description: The Three Stooges

dn: cn=Manager,o=t0e
objectClass: organizationalRole
cn: Manager
description: LDAP Directory Administrator

dn: ou=GroupA,o=t0e
ou: GroupA
objectClass: top
objectClass: organizationalUnit
description: Members of GroupA

dn: ou=GroupB,o=t0e
ou: GroupB
objectClass: top
objectClass: organizationalUnit
description: Members of GroupB

dn: cn=Kenneth Burgener,ou=GroupA,o=t0e
ou: GroupA
o: t0e
cn: Kenneth Burgener
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
mail: kenneth@kennethburgener.org
givenname: Kenneth
sn: Burgener
uid: kenneth
homePostalAddress: PO Box 2008$Orem UT  84059
postalAddress: PO Box 2008
l: Orem
st: UT
postalcode: 84059
telephoneNumber: (800)555-1212
homePhone: 800-555-1313
facsimileTelephoneNumber: 800-555-1414
userPassword: mypass
title: Account Executive
destinationindicator: /bios/images/lfine.jpg

LDAP Authentication

LDAP authentication takes three forms:

  1. No authentication: Read access granted to all. The Stooges and Delta house examples in the YoLinux LDAP Tutorial are of this form.
  2. Basic authentication: Client must bind with a DN and password. (Described in this tutorial)
  3. Secure authentication: Secure encrypted or authenticated connection.

Single Logon

access to attrs=userPassword
  by self write
  by dn="uid=root,ou=users,dc=oeey,dc=com" write
  by * auth

access to *
  by * auth

defaultaccess   none                         - Deny anonymous viewing and access

access to attr=userPassword                  - Deny anonymous viewing of passwords
       by dn="cn=DeanWormer,o=delta" write   - LDAP root not denied
       by self write                         - Allow user to update his password
       by * auth                             - Allow access to bind to LDAP (i.e. login requires access to password but still not allowed to view it)

access to *
       by dn="cn=DeanWormer,o=delta"  write  - LDAP root has full access
       by dn="cn=fratbrother,o=delta" read   - Required for first example. Allow this user to read the database. (Except passwords which are denied above)
       by users read                         - Required in second example where user logs in with his own password to read LDAP database. Reading of passwords other than his own is denied.
       by self write
       by * auth

userPassword: fratsecret
userPassword: {CRYPT}frzelFSD.VhkI

Password created with the command: 

perl -e 'print("userPassword: {CRYPT}".crypt("fratsecret","frat-salt")."\n");'
userPassword: {CRYPT}frzelFSD.VhkI

Unique user login ids and passwords

"This method of LDAP database protection is a little more sophisticated because it requires a password (LDAP attribute: userPassword) for each user. Read access is granted to the users in the slapd.conf file by the statement "by users read". The "by users read" is suited for an LDAP address directory which would be accessed by email clients. It gives the user access to query and download the appropriate email data to their address books. It might not be appropriate for a pure authentication server because it allows one to see all the users of the system possibly exposing too much private data. One has to evaluate their own security needs. "

Access/Administration based on organizational group access

File: /etc/openldap/slapd.conf 

   ..
   ...
   defaultaccess   none
   access to attr=userPassword
          by dn="cn=DeanWormer,o=delta" write
          by self write
          by * auth
   access to dn=".*,ou=1963,o=delta"
          by dn="cn=Admin1963,o=delta" write
          by self write
          by users read
          by * auth
   access to *
          by dn="cn=DeanWormer,o=delta"  write
          by dn="cn=fratbrother,o=delta" read
          by self write
          by users read
          by * auth

Access based on an attribute value

File: /etc/openldap/slapd.conf 

...
access to dn=".*,o=stooges" filter="departmentNumber=dept100"
       by self write
       by dn="cn=Admin100,o=stooges" write

Reference

Reference: Linux LDAP Tutorial: Add a login, password protection and security to your OpenLDAP directory

Search and Compare

The Search operation is used to both search for and read entries. Its parameters are: [3]

baseObject

The DN (Distinguished Name) of the entry at which to start the search,

scope

BaseObject (search just the named entry, typically used to read one entry), singleLevel (entries immediately below the base DN), or wholeSubtree (the entire subtree starting at the base DN).

filter

How to examine each entry in the scope. E.g. (&(objectClass=person)(|(givenName=John)(mail=john*))) - search for persons who either have given name John or an e-mail address starting with john.

derefAliases

Whether and how to follow alias entries (entries which refer to other entries),

attributes

Which attributes to return in result entries.

sizeLimit, timeLimit

Max number of entries, and max search time.

typesOnly

Return attribute types only, not attribute values.

memberof overlay

Load module: 

moduleload memberof.la
overlay memberof

Note: ignore the "null module" warning if you run debug. That just means it was a built in module.

conf: 

        include /usr/share/openldap/schema/core.schema
        include /usr/share/openldap/schema/cosine.schema

        authz-regexp "gidNumber=0\\\+uidNumber=0,cn=peercred,cn=external,cn=auth"
                "cn=Manager,dc=example,dc=com"
        database        bdb
        suffix          "dc=example,dc=com"
        rootdn          "cn=Manager,dc=example,dc=com"
        rootpw          secret
        directory       /var/lib/ldap2.4
        checkpoint 256 5
        index   objectClass   eq
        index   uid           eq,sub

        overlay memberof

ldif: 

        cat memberof.ldif
        dn: dc=example,dc=com
        objectclass: domain
        dc: example

        dn: ou=Group,dc=example,dc=com
        objectclass: organizationalUnit
        ou: Group

        dn: ou=People,dc=example,dc=com
        objectclass: organizationalUnit
        ou: People

        dn: uid=test1,ou=People,dc=example,dc=com
        objectclass: account
        uid: test1

        dn: cn=testgroup,ou=Group,dc=example,dc=com
        objectclass: groupOfNames
        cn: testgroup
        member: uid=test1,ou=People,dc=example,dc=com

Search: 

# ldapsearch -LL -Y EXTERNAL -H ldapi:/// "(uid=test1)" -b dc=example,dc=com memberOf
 SASL/EXTERNAL authentication started
 SASL username: gidNumber=0+uidNumber=0,cn=peercred,cn=external,cn=auth
 SASL SSF: 0
 version: 1

 dn: uid=test1,ou=People,dc=example,dc=com
 memberOf: cn=testgroup,ou=Group,dc=example,dc=com

ldapsearch -h ldap -x -b "dc=shop,dc=lan" '(uid=jordan)' memberOf
ldapsearch -h ldap -x -b "dc=shop,dc=lan" '(uid=jordan)' memberOf uid

References:

Schema

"The schema defines the attribute types that directory entries can contain."

OpenSSH LDAP

yum install openssh-ldap

/etc/openldap/ 

include         /usr/share/doc/openssh-ldap-6.2p2/openssh-lpk-openldap.schema

diff: 

objectClass: ldapPublicKey
sshPublicKey: ssh-rsa ....

kenneth.diff: 

dn: uid=kenneth,ou=users,dc=oeey,dc=net
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
objectClass: posixAccount
objectClass: shadowAccount
objectClass: ldapPublicKey
givenName: Kenneth
sn: Burgener
cn: kenneth
uid: kenneth
mail: kenneth@serenitysolution.com
description: Kenneth Burgener
shadowLastChange: 15146
shadowMax: 99999
shadowWarning: 7
loginShell: /bin/bash
uidNumber: 10
gidNumber: 10
homeDirectory: /home/kenneth
sshPublicKey: ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAvMct4Ut8wZDEMnDyRz6TiAbYGLX5YilVdpuU5ZGbLxOjEfmhvo1PFHy+BT0q3kyKzaY6Ia+3\
RGlvS/N6GrF/nZeIX+VE6CGuK+X5ZYALghPNh3JXnqdwlOr/gEfuz/xvE2mk0Cqy1oJzRqDumNzcIDyiEZQ0C4O4udHpmX/7X0/fCN6vszmkdJPJqiJOL/sxuG\
8YCgY+WoOnNnRv9AF77QAR7eoAIKFQcJ6hnpD5Woy5YT1quQwkWlSsFTTtBWWoGCaKr/AcuUcyvB1AQXDMePqdzXYesgexP69ILMnisTP2CIeMIERLAdUjXOaZ\
pFU9fuWNu1VSSbIwQwMhzCWyyQ== kenneth@t0e.org

/etc/ssh/ldap.conf 

BASE    dc=oeey,dc=net
URI     ldap://ldap.oeey.net
SSL     no

Test with: 

/usr/libexec/openssh/ssh-ldap-helper -d -s kenneth

Add second key: 

ldapmodify -x -D cn=admin,dc=oeey,dc=net -w mypassword < k.mod.diff

# k.mod.diff
dn: uid=kenneth,ou=users,dc=oeey,dc=net
add: sshPublicKey
sshPublicKey: ssh-rsa ...

References:

--- SSL --- 

cp rootCA.crt /etc/pki/tls/certs/
cp /etc/pki/tls/certs/rootCA.crt /etc/openldap/cacerts

/etc/ssh/ldap.conf 

BASE    dc=oeey,dc=net
URI     ldaps://ldap.oeey.net
TLS_CACERTDIR /etc/openldap/cacerts

/etc/stunnel/stunnel.conf: 

cert = /etc/stunnel/oeey.net.pem
[ldaps]
  accept=636
  connect=389

Create serial CA: http://www.openldap.org/lists/openldap-technical/201109/msg00203.html 

cd /etc/openldap/cacerts/
ln -s ca.pem `openssl x509 -noout -hash -in ca.pem`.0

This will avoid this: 

# /usr/libexec/openssh/ssh-ldap-helper -d -s kenneth
ldap_simple_bind Can't contact LDAP server
reconnecting to LDAP server...

SSL_accept: 14094418: error:14094418:SSL routines:SSL3_READ_BYTES:tlsv1 alert unknown ca


Test: 

/usr/libexec/openssh/ssh-ldap-helper -d -s kenneth

echo "" | openssl s_client -connect ldap.oeey.net:636

echo "" | openssl s_client -connect ldap.oeey.net:636 -showcerts -CAfile /etc/openldap/cacerts/ca.cert.pem

/etc/ssl/certs -> /etc/pki/tls/certs

Thunderbird

MailNews:Mozilla LDAP Address Book Schema - MozillaWiki

Linux Magazine - LDAP Authentication

  1. Linux Magazine: LDAP Authentication, Part One - http://www.linux-mag.com/id/3722/
  2. Linux Magazine: LDAP Authentication, Part Two - http://www.linux-mag.com/id/4124/
  3. Linux Magazine: LDAP Authentication, Part Three - http://www.linux-mag.com/id/4129/

Terms

LDAP uses a number of acronyms to refer to types of structures within its directories. These include:

  • domain component (DC)
  • distinguished name (DN)
  • common name (CN)
  • organizational unit (OU).

Example describing user account: 

dn: cn=Fred Jones,dc=keylabs,dc=com

Backend database:

  • To actually store data, LDAP must use some sort of database as a backend. One common backend is the Berkeley DB package (http://www.sleepycat.com), but others are available. To the LDAP client, the backend package is invisible except if it negatively affects the LDAP server’s performance.

OpenLDAP:

OpenLDAP is an open source suite of LDAP (Lightweight Directory Access Protocol) applications and development tools. LDAP is a set of protocols for accessing directory services (usually phone book style information, but other information is possible) over the Internet, similar to the way DNS (Domain Name System) information is propagated over the Internet.

Package openldap:

The openldap package contains configuration files, libraries, and documentation for OpenLDAP. (source: yum info openldap)

Pacakge openldap-clients:

The openldap-clients package contains the client programs needed for accessing and modifying OpenLDAP directories. (source: yum info openldap-clients)

Pacakge openldap-servers:

The openldap-servers package contains the slapd and slurpd servers, migration scripts, and related files. (source: yum info openldap-servers)

Server Installation

Installation: 

yum install openldap openldap-clients openldap-servers

Basic LDAP Configuration

The LDAP server itself (slapd) is controlled through a file called slapd.conf, which is usually stored in /etc/openldap. Two other LDAP configuration files, both called ldap.conf, control LDAP client operations. The /etc/ldap.conf file is used by LDAP’s Name Service Switch (NSS) interfaces, while /etc/openldap/ldap.conf specifies defaults for various LDAP client programs. For now, concentrate on slapd.conf.
/etc/openldap/slapd.conf
/etc/ldap.conf  # only found on clients using NSS
/etc/openldap/ldap.conf

Basic Setup:

chances are your default configuration will work reasonably well once you’ve entered a few site-specific items. The first of these is to load an LDAP schema (a set of rules) for handling Linux account information.

Authentication Schema: (/etc/openldap/slapd.conf)

include /etc/openldap/schema/nis.schema
required for LDAP to function solely as a network authentication server

Make test certificate: 

cd /etc/pki/tls/certs
rm -f slapd.pem
make slapd.pem
# Enter in details
# Set common name to ldap hostname
chown ldap:ldap slapd.pem

Configure Server: (/etc/openldap/slapd.conf) 

## uncomment lines 51, 52
TLSCertificateFile /etc/pki/tls/certs/slapd.pem
TLSCertificateKeyFile /etc/pki/tls/certs/slapd.pem
## add lines 53:
TLSCipherSuite HIGH
security ssf=128
password-hash {SSHA}

## add lines 83: (update dn to match site)
## I also like "users" over "Users" or "People"
# ACLs:
# line 1 - users can change their own passwords
# line 2 - root can overwrite any password
# line 3 - users can authenticate against password
access to attrs=userPassword
  by self write
  by dn="uid=root,ou=users,dc=t0e,dc=org" write
  by * auth

# everyone can read the whole directory tree
access to *
  by * read

access to attrs=userPassword
  filter=(!(shadowexpire=0))
  by self write
  by dn="uid=root,ou=users,dc=oeey,dc=com" write
  by * auth

access to *
  filter=(!(shadowexpire=0))
  by * read

## change line 99:
## I Like "admin" over "Manager"
suffix "dc=t0e,dc=org"
rootdn "cn=admin,dc=t0e,dc=org"
rootpw test12
## rootpw test
## rootpw {SSHA}JwdTsA21MtN9h9Hu3RDYPNAoPhm9SiKj

Notes:

  • rootdn is user who will administer the system. Conventionally either Manager or admin.
  • You can use the slappasswd command to generate the root password

ACLS:

  • The first block of lines specifies rules for access to the userPassword attribute, which holds user passwords, as you might have guessed. Specifically, users may write their own passwords (by self write), root may overwrite any password, and all users may authenticate against passwords (by*auth).
  • The second block of lines gives all users read access to the rest of the information in the directory (much as all users may read /etc/passwd).
  • When specifying LDAP ACLs, order is important; earlier entries take precedence over later ones. Thus, the earlier ACL for userPassword, which doesn’t specify any read access, takes precedence over the later global read access ACL. This configuration prevents each user from reading his or her — or anyone’s — password.

Enable LDAPS: 

/etc/sysconfig/ldap
SLAPD_LDAPS=yes

Start service: 

service ldap restart

Ports:

  • LDAP binds to port 389, which is usually adequate for use with Linux clients.
  • Some other clients, though, may require LDAP to be bound to port 636 for secure LDAP (LDAPS) operation.
TCP port 389  # LDAP
TCP port 636  # LDAPS

Check Config

Check config syntax: 

slaptest

Note: Initially will complain about missing DB_CONFIG. We will take care of that next

LDIF Local Management

LDIF:

LDAP relies on the LDAP Data Interchange Format (LDIF) to describe information stored in its directories. LDIF is a text format that LDAP can parse, extracting the relevant data for inclusion in the backend database.

Account Migration:

One useful approach to setting up a new LDAP server as an account maintenance system is to migrate an existing Linux account database. The tools to do this are available as scripts from http://www.padl.com/OSS/MigrationTools.html.
wget http://www.padl.com/download/MigrationTools.tgz
tar -zvxf MigrationTools.tgz
cd MigrationTools-47

Edit vim migrate_common.ph: 

# Default DNS domain
$DEFAULT_MAIL_DOMAIN = "keylabs.com";

# Default base
$DEFAULT_BASE = "dc=keylabs,dc=com";

# Match to be either People (or Users) depending on what you use elsewhere
$NAMINGCONTEXT{'passwd'}            = "ou=People";

Copy passwd and group file, and remove all but "user" accounts and groups: 

cp /etc/passwd passwd
cp /etc/group group

sample passwd: 

kenneth:x:500:500::/home/kenneth:/bin/bash
mike:x:501:501::/home/mike:/bin/bash

sample group: 

kenneth:x:500:
mike:x:501:

Genearte LDIF: 

# sudo ./migrate_passwd.pl /etc/passwd passwd.ldif
# sudo ./migrate_group.pl /etc/group group.ldif
sudo ./migrate_passwd.pl passwd passwd.ldif
sudo ./migrate_group.pl group group.ldif

create basic_passwd.ldif (or add lines to the start of passwd.ldif): 

dn: dc=keylabs,dc=com
objectClass: domain
dc: keylabs

dn: ou=People,dc=keylabs,dc=com
objectClass: organizationalUnit
ou: People

passwd.ldif: 

dn: uid=kenneth,ou=People,dc=lab
uid: kenneth
cn: kenneth
objectClass: account
objectClass: posixAccount
objectClass: top
objectClass: shadowAccount
userPassword: {crypt}$1$kU24pyY6$7R02lZjyg5XM9iUIQpj5e/
shadowLastChange: 15143
shadowMax: 99999
shadowWarning: 7
loginShell: /bin/bash
uidNumber: 500
gidNumber: 500
homeDirectory: /home/kenneth

create basic_group.ldif (or add lines to the start of the group.ldif): 

dn: ou=Group,dc=keylabs,dc=com
objectClass: organizationalUnit
ou: Group

group.ldif: 

dn: cn=kenneth,ou=Group,dc=lab
objectClass: posixGroup
objectClass: top
cn: kenneth
userPassword: {crypt}x
gidNumber: 500

Note: to add opther users to a group, add 'memberUid: kenneth' lines to the group definition 

memberUid: kenneth

Shut down ldap server: 

service ldap stop

Avoid DB Config error message: 

cp /etc/openldap/DB_CONFIG.example /var/lib/ldap/DB_CONFIG
chown ldap:ldap /var/lib/ldap/DB_CONFIG

Import LDIF: 

sudo slapadd -v -l basic_passwd.ldif
sudo slapadd -v -l basic_group.ldif
sudo slapadd -v -l passwd.ldif
sudo slapadd -v -l group.ldif

Fix permissions: 

 chown ldap:ldap /var/lib/ldap/*

Start ldap server: 

service ldap start

List contents of LDAP: (good for backup purposes) 

# slapcat - SLAPD database to LDIF utility
# The LDIF generated by this tool is suitable for use with slapadd (not ldapadd)
slapcat
slapcat -l [OUTFILE].ldif

If you get this error: 

bdb_db_open: Warning - No DB_CONFIG file found in directory /var/lib/ldap: (2)
Expect poor performance for suffix dc=keylabs,dc=com.

cp /etc/openldap/DB_CONFIG.example /var/lib/ldap/DB_CONFIG
chown ldap:ldap /var/lib/ldap/DB_CONFIG

Account maintenance:

you could use the ldapadd utility instead of slapadd; however, ldapadd requires you to have configured LDAP for account maintenance, as described shortly.

Get Accounts: Once your system is configured to use LDAP for authentication, you’ll be able to type 'getent passwd' to obtain a complete list of accounts to help avoid LDAP uid and uidNumber collisions 

getent passwd

If you want to set a password at account-creation time, you can use 'slappasswd' to generate an encrypted value 

slappasswd

Backup Database

sudo slapcat -l backup.ldif

Note: Make sure to backup config files in /etc/openldap

Restore Database

Perform steps in "Rebuild Database", but use the backup.ldif for slapadd 

sudo slapadd -v -l backup.ldif

Note: Make sure to restore config files in /etc/openldap

Rebuild Database

If you need to clear and rebuild the database: 

service ldap stop
mv /var/lib/ldap /var/lib/ldap-old
mkdir /var/lib/ldap
chmod 700 /var/lib/ldap
chown ldap:ldap /var/lib/ldap
cp /etc/openldap/DB_CONFIG.example /var/lib/ldap/DB_CONFIG
chown ldap:ldap /var/lib/ldap/DB_CONFIG 
# slapadd ...
# slapadd ...
# slapadd ...
chown ldap:ldap /var/lib/ldap/*
service ldap start

Client Configuration

Install base ldap libraries and configuration files: 

yum install openldap

/etc/openldap/ldap.conf: 

BASE		dc=keylabs,dc=com
URI		ldaps://ldap.keylabs.com
TLS_CACERT	/etc/pki/tls/certs/slapd.pem

The /etc/pki/tls/certs/slapd.pem just contains the public key "-----BEGIN CERTIFICATE-----". Grab from the LDAP server.

LDIF Remote Management

These tools can be used locally and remotely.

Installation: 

yum install openldap-clients

Tools: 

ldapadd
ldapmodify
ldappasswd
ldapdelete
ldapsearch

Note: '-x' Use simple authentication instead of SASL. (from /etc/openldap.ldap.conf)

set the BASE, URI, and TLS_CACERT options in this file: /etc/openldap/ldap.conf 

BASE		dc=oeey,dc=com
URI		ldaps://ldap.oeey.com
TLS_CACERT	/etc/pki/tls/certs/slapd.pem

URI		ldap://ldap.oeey.com
URI		ldap://ldap.oeey.com:389
URI		ldap://ldap.oeey.com

To ignore SALP certs: [4] 

TLS_REQCERT allow

On the client install the following: 

yum install openldap openldap-clients

URI Bind: 

# URI bind
ldapadd -H ldaps://ldap.lab -D cn=admin,dc=lab -W -f mike.ldif

# error when not using simple bind:
ldap_sasl_interactive_bind_s: No such attribute (16)

# error when trying non SSL connection:
ldap_sasl_interactive_bind_s: Confidentiality required (13)
        additional info: confidentiality required

ldapadd

Add user: 

#  -x  Use simple authentication instead of SASL.
ldapadd -x -D cn=manager,dc=oeey,dc=com -W -f acct.ldif

ldapdelete

Delete user: 

ldapdelete -x -D cn=manager,dc=oeey,dc=com -W uid=mike,ou=People,dc=oeey,dc=com

ldappasswd

Change user's password: 

ldappasswd -x -D cn=manager,dc=oeey,dc=com -S -W uid=kenneth,ou=People,dc=oeey,dc=com

-S           # Prompt for new password
-s [passwd]  # Set the new password to [passwd]
-x           # Use simple authentication instead of SASL

ldapwhoami

Quick check to validate login 

ldapwhoami - LDAP who am i? tool

ldapwhoami -x -D uid=kenneth,ou=Users,dc=oeey,dc=com -W

ldapwhoami -x -D uid=kenneth,ou=Users,dc=oeey,dc=com -w mypassword

ldapmodify

Add user to group: 

ldapmodify -x -D cn=admin,dc=oeey,dc=com -W

dn: cn=jira,ou=groups,dc=oeey,dc=com
add: memberUid
memberUid: kenneth

Disable User: 

ldapmodify -x -D cn=admin,dc=oeey,dc=com -W

dn: uid=mike,ou=users,dc=oeey,dc=com
add: shadowexpire
shadowexpire: 0

Enable User: 

ldapmodify -x -D cn=admin,dc=oeey,dc=com -W

dn: uid=mike,ou=users,dc=oeey,dc=com
delete: shadowexpire

Move User: [5] 

ldapmodify -x -D cn=admin,dc=oeey,dc=com -W

dn: uid=sgray,ou=users,dc=oeey,dc=com
changetype: modrdn
newrdn: uid=sgray
deleteoldrdn: 0
newsuperior: ou=disabled,dc=oeey,dc=com

Rename User: 

dn: uid=sgray,ou=users,dc=oeey,dc=com
changetype: modrdn
newrdn: uid=stan
deleteoldrdn: 1

dn: uid=sgray,ou=users,dc=oeey,dc=com
changetype: moddn
newRDN: uid=stan
deleteOldRDN: 1

Delete User: 

dn: uid=sgray,ou=users,dc=oeey,dc=com
changetype: delete

Modify Attribute: 

dn: uid=sgray,ou=users,dc=oeey,dc=com
changetype: modify
replace: description
description: This is the new description for John Doe

Add Atribute: 

dn: uid=sgray,ou=users,dc=oeey,dc=com
add: mailAlternateAddress
mailAlternateAddress: jdoe@example.com

ldapsearch

ldapsearch -x   # use connection details in /etc/openldap/ldap.conf
ldapsearch -x -b dc=oeey,dc=com

ldapsearch -H ldap://ldap.oeey.com -b dc=oeey,dc=com -x
ldapsearch -H ldaps://ldap.oeey.com -b dc=oeey,dc=com -x

# list all bash users, listing 'dn' and 'cn'
ldapsearch -x -b dc=oeey,dc=com '(loginShell=/bin/bash)' dn cn

# list all user objects (including base 'user' object)
ldapsearch -x -b ou=users,dc=oeey,dc=com

# list all user objects only with an uid, and list the uid
ldapsearch -x -b ou=users,dc=oeey,dc=com "(uid=*)" uid

memberOf:

PAM and NSS

PAM is a security tool; it tells login tools, such as the text-mode login process or the GUI GNOME Display Manager (GDM) or KDE Display Manager (KDM), that the password a user types is (or is not) correct for the specified username. PAM also handles some additional tasks, such as changing passwords when a user runs the passwd utility.

NSS handles less sensitive account data, such as the path to a user’s home directory, his or her default shell, and so on.

If you configure PAM but not NSS to use LDAP, only users who have local account data stored in /etc/passwd and /etc/shadow will be able to log in. These files could lack passwords, but they’d have to host the normal NSS data.

If you configure NSS but not PAM to use LDAP, then Linux will believe it has accounts for the users defined on the LDAP server, but those users won’t be able to log in. Thus, to use an LDAP server for authentication, you must normally reconfigure both PAM and NSS to use LDAP. Either alone could be useful in some limited circumstances, but in most cases you must configure both to use LDAP.

Install NSS LDAP package: 

yum install nss_ldap

/etc/ldap.conf 

host ldap.keylabs.com
base dc=keylabs,dc=com

/etc/nsswitch.conf 

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

Get Accounts: Once your system is configured to use LDAP for authentication, you’ll be able to type 'getent passwd' to obtain a complete list of accounts to help avoid LDAP uid and uidNumber collisions 

getent passwd
getent group

/etc/pam.d/system-auth add the following lines immediately before their respective pam_unix.so lines: 

auth        sufficient    pam_ldap.so try_first_pass
auth        sufficient    pam_unix.so nullok try_first_pass

account     sufficient    pam_ldap.so
account     sufficient    pam_unix.so  # changed from required

password    sufficient    pam_ldap.so use_authtok debug
password    sufficient    pam_unix.so md5 shadow nullok try_first_pass use_authtok

session     required      pam_ldap.so use_first_pass
session     required      pam_mkhomedir.so skel=/etc/skel umask=0027
session     required      pam_unix.so

PAM modules are stored here: /lib/security/

To allow only local LDAP users to login, add the following to the top of the account section: (see 'man pam_localuser') 

account     required      pam_localuser.so

To allow only users in a group to login, add the following: [6] 

/etc/login.group.allowed:
root
wheel
login
git

auth        required      pam_listfile.so onerr=fail item=group sense=allow file=/etc/login.group.allowed

To allow only certain users to login, add the following: 

auth        required      pam_listfile.so \
                          onerr=fail item=user sense=allow file=/etc/loginusers

Bind timeout in /etc/ldap.conf: 

# Search timelimit
#timelimit 30
timelimit 120

# Bind/connect timelimit
#bind_timelimit 30
bind_timelimit 120

# Reconnect policy: hard (default) will retry connecting to
# the software with exponential backoff, soft will fail
# immediately.
#bind_policy hard

NOTE: Setting bind_timelimit to a lower number will also help if the LDAP server is offline, as this controls the connect timeout.

Disable Users

Add filter: 

access to *
  filter=(!(shadowexpire=0))
  by * read

Test login: 

ldapwhoami -x -D uid=mike,ou=users,dc=oeey,dc=com -W

Disable User: 

ldapmodify -x -D cn=admin,dc=oeey,dc=com -W
dn: uid=mike,ou=users,dc=oeey,dc=com
add: shadowexpire
shadowexpire: 0

Enable User: 

ldapmodify -x -D cn=admin,dc=oeey,dc=com -W
dn: uid=mike,ou=users,dc=oeey,dc=com
delete: shadowexpire

References:

SASL

Couldn't ever get this to work. See SASL

Maybe have to change /etc/sysconfig/saslauthd:  ??? 

# Mechanism to use when checking passwords.  Run "saslauthd -v" to get a list
# of which mechanism your installation was compiled with the ablity to use.
# MECH=pam
MECH=ldap

OpenLDAP Software 2.4 Administrator's Guide: Using SASL - http://www.openldap.org/doc/admin24/sasl.html

OpenLDAP, OpenSSL, SASL and KerberosV HOWTO - http://www.bayour.com/LDAPv3-HOWTO.html

Apache

yum install mod_authz_ldap

/etc/httpd/conf.d/authz_ldap.conf 

LoadModule authz_ldap_module modules/mod_authz_ldap.so

<IfModule mod_authz_ldap.c>

   <Location />

      AuthzLDAPAuthoritative on
      AuthzLDAPMethod ldap

      AuthzLDAPServer ldap.oeey.com
      AuthzLDAPUserBase ou=users,dc=oeey,dc=com
      AuthzLDAPUserKey uid
      AuthzLDAPUserScope base

      AuthType basic
      AuthName "svn"
      require valid-user

   </Location>

</IfModule>

See mod_authz_ldap - http://authzldap.othello.ch/configuration.html

Sample Jira Access

  • * LDAP Host: ldap://localhost:389
  • * BaseDN: ou=Users,dc=example,dc=com
  • Bind DN:
  • Bind Password:
  • * Search Attribute: uid
  • Sample user to authenticate: kenneth
  • Sample user's password:
LDAP:  ldap://localhost:389/dc=apollo,dc=biipr,dc=com
User DN pattern: uid={0},cn=users

python-ldap

Yum installation of python-ldap package: 

yum install python-ldap

Installation of python-ldap package: (could not get to work) 

yum install gcc openldap-devel
wget http://pypi.python.org/packages/source/p/python-ldap/python-ldap-2.3.13.tar.gz#md5=895223d32fa10bbc29aa349bfad59175
tar -zvxf python-ldap-2.3.13.tar.gz
cd python-ldap-2.3.13
python setup.py install  # FAILED BUILD

Simple Example: 

#!/usr/bin/env python
import ldap
server = 'ldap://ldap.keylabs.com'
con = ldap.initialize(server)
dn='uid=joe,ou=People,dc=keylabs,dc=com'
pw='test12'
con.simple_bind_s( dn, pw )

Login Example: 

#!/usr/bin/env python
import sys
import ldap
user_dn='uid=joe,ou=People,dc=keylabs,dc=com'
user_pw='test12q'
server = 'ldap://ldap.keylabs.com'
l = ldap.initialize(server)

try: 
    #l.start_tls_s()
    l.bind_s(user_dn, user_pw)
except ldap.INVALID_CREDENTIALS:
    print "Your username or password is incorrect."
    sys.exit()
except ldap.LDAPError, e:
    if type(e.message) == dict and e.message.has_key('desc'):
        print e.message['desc']
    else: 
        print e
    sys.exit()

print "Login Successful"

Linux Magazine - Integrating LDAP and Kerberos

  1. Linux Magazine: Integrating LDAP and Kerberos: Part One (Kerberos) - http://www.linux-mag.com/id/4738/
  2. Linux Magazine: Integrating LDAP and Kerberos: Part Two (LDAP) - http://www.linux-mag.com/id/4765/

Python LDAP Applications

A series of articles by Matt Butcher about python-ldap:


LDAP Programming in Python | Linux Journal - http://www.linuxjournal.com/article/6988

http://www.grotan.com/ldap/python-ldap-samples.html - python-ldap sample code

python-ldap

Source Installation: 

yum install gcc openldap-devel
wget http://pypi.python.org/packages/source/p/python-ldap/python-ldap-2.3.13.tar.gz#md5=895223d32fa10bbc29aa349bfad59175
tar -zvxf python-ldap-2.3.13.tar.gz
cd python-ldap-2.3.13
python setup.py install  # FAILED BUILD!

Yum Installation: 

yum install python-ldap

LDAP Programming in Python | Linux Journal - http://www.linuxjournal.com/article/6988

python-ldap: LDAP client API for Python - http://www.python-ldap.org/

Python Package Index : python-ldap 2.3.13 - http://pypi.python.org/pypi/python-ldap/ 

import ldap
server = 'ldap://ldap.keylabs.com'
con = ldap.initialize(server)
dn='uid=joe,ou=People,dc=keylabs,dc=com'
pw='test12'
con.simple_bind_s( dn, pw ) 

import sys
import ldap
user_dn='uid=kenneth,ou=People,dc=keylabs,dc=com'
user_pw='test12'
server = 'ldaps://ldap.keylabs.com'
l = ldap.initialize(server)

try: 
    #l.start_tls_s()
    l.bind_s(user_dn, user_pw)
except ldap.INVALID_CREDENTIALS:
    print "Your username or password is incorrect."
    sys.exit()
except ldap.LDAPError, e:
    if type(e.message) == dict and e.message.has_key('desc'):
        print e.message['desc']
    else: 
        print e
    sys.exit()

print "Login Successful"

If you get this error, try "ldaps://..." for the server 

AttributeError: CONFIDENTIALITY_REQUIRED instance has no attribute 'message'

If you get this error, make sure /etc/openldap/ldap.conf is configured. See "Client Configuration" section. 

AttributeError: SERVER_DOWN instance has no attribute 'message'

Windows LDAP

applied procrastination: python-ldap authentication and you - http://appliedprocrastination.blogspot.com/2009/03/python-ldap-authentication-and-you.html

Here's how I managed to make my python client code running on a Debian/Ubuntu box authenticate against a Windows Active Directory LDAP server:

1) Obtain the server's cert: openssl s_client -showcerts -connect myserver.com:636 > their_server.pem

2) Edit the resulting file to isolate just the cert you want. In my case, the file had two certs embedded in it, plus some identifying cruft. Preceding the first, desired cert was a block that looked like this: 0 s:/C=US/ST=MyState/L=MyCity/O=My Company Inc./OU=Information Technology/OU=For Intranet Use Only/CN=my.host.com, followed by -----BEGIN CERTIFICATE-----. Next came VeriSign's cert. Delete everything but the CERTIFICATE block for your server, including the BEGIN and END lines, and save to /etc/ssl/certs/myserver.pem -- you can save to any location, really.


And here's the code: 

#!/usr/bin/env python

import ldap
#ldap.set_option(ldap.OPT_DEBUG_LEVEL,4095)
ldap.set_option(ldap.OPT_X_TLS_REQUIRE_CERT, ldap.OPT_X_TLS_NEVER)
ldap.set_option(ldap.OPT_X_TLS_CACERTFILE,"/etc/ssl/certs/myserver.pem")
l = ldap.initialize("ldaps://myserver.com:636")
l.set_option(ldap.OPT_PROTOCOL_VERSION, 3)
l.simple_bind_s("username@DOMAIN","password")

Build from Source

BerkelyDB: (http://www.oracle.com/technetwork/database/berkeleydb/downloads/index-082944.html) 

# Install compatible version of BerkeleyDB:
mkdir -p ~/src ; cd ~/src
wget http://download.oracle.com/berkeley-db/db-4.4.20.NC.tar.gz
tar -zvxf db-4.4.20.NC.tar.gz
cd db-4.4.20.NC/build_unix/
../dist/configure --prefix=/opt/db
make
sudo make install

# Build OpenLDAP:
mkdir -p ~/src ; cd ~/src
yum install db4 db4-devel  # BerklyDB
wget ftp://ftp.openldap.org/pub/OpenLDAP/openldap-stable/openldap-stable-20100719.tgz
tar -zvxf openldap-stable-20100719.tgz
cd openldap-2.4.23
# ./configure --enable-overlays=yes --enable-memberof=yes --prefix=/opt/ldap
CPPFLAGS=-I/opt/db/include LDFLAGS=-L/opt/db/lib ./configure --enable-overlays=yes --enable-memberof=yes --prefix=/opt/ldap
make
make install

default /opt/ldap/etc/openldap/slapd.conf: 

include		/opt/ldap/etc/openldap/schema/core.schema
pidfile		/opt/ldap/var/run/slapd.pid
argsfile	/opt/ldap/var/run/slapd.args
database	bdb
suffix		"dc=my-domain,dc=com"
rootdn		"cn=Manager,dc=my-domain,dc=com"
rootpw		secret
directory	/opt/ldap/var/openldap-data
index		objectClass	eq

Enable memberOf

How to enable 'memberof': Reverse Group Membership overlay no|yes|mod [no]

new /opt/ldap/etc/openldap/slapd.conf: 

include		/opt/ldap/etc/openldap/schema/core.schema
include		/opt/ldap/etc/openldap/schema/cosine.schema
include		/opt/ldap/etc/openldap/schema/inetorgperson.schema
include		/opt/ldap/etc/openldap/schema/nis.schema
pidfile		/opt/ldap/var/run/slapd.pid
argsfile	/opt/ldap/var/run/slapd.args
database	bdb
suffix		"dc=t0e,dc=org"
rootdn		"cn=Manager,dc=t0e,dc=org"
rootpw		secret
directory	/opt/ldap/var/openldap-data
index		objectClass	eq
overlay		memberof

Environment Configuration: 

cd /opt/ldap/etc/openldap
PATH=/opt/ldap/sbin:/opt/ldap/bin:$PATH
export LD_LIBRARY_PATH=/opt/db/lib

Check configuration: 

sbin/slaptest   # check for config issues

Clear database: (stop ldap first) 

rm -rf var/openldap-data/*

Fix DB_CONFIG: 

cp etc/openldap/DB_CONFIG.example var/openldap-data/DB_CONFIG

Start server: 

libexec/slapd -d 9

basic.ldif: 

dn: dc=t0e,dc=org
objectClass: domain
dc: t0e

dn: ou=users,dc=t0e,dc=org
objectClass: organizationalUnit
ou: users

dn: uid=kenneth,ou=users,dc=t0e,dc=org
uid: kenneth
cn: kenneth
objectClass: account
objectClass: posixAccount
objectClass: top
objectClass: shadowAccount
userPassword: e1NTSEF9bUlSOVZtTHZaTGFsTWQrZWdFZWxudVppa2oyV2Q0cEU=
shadowLastChange: 15143
shadowMax: 99999
shadowWarning: 7
loginShell: /bin/bash
uidNumber: 500
gidNumber: 500
homeDirectory: /home/kenneth

dn: ou=groups,dc=t0e,dc=org
objectClass: organizationalUnit
ou: groups

dn: cn=kenneth,ou=groups,dc=t0e,dc=org
objectClass: posixGroup
objectClass: top
cn: kenneth
userPassword: {crypt}x
gidNumber: 500

dn: cn=jirausers,ou=groups,dc=t0e,dc=org
objectclass: groupofnames
cn: jirausers
description: Users allowed to use Jira
member: uid=kenneth,ou=groups,dc=t0e,dc=org
# member: uid=stan,ou=groups,dc=t0e,dc=org

Stop server and add basic items: 

killall slapd
slapadd slapadd -v -l basic.ldif

Restart server: 

libexec/slapd -d 9

List database: 

slapcat

Change user's password: 

ldappasswd -x -D cn=Manager,dc=t0e,dc=org -w secret uid=kenneth,ou=users,dc=t0e,dc=org -s test12

Verify login worked: 

ldapwhoami -x -D uid=kenneth,ou=users,dc=t0e,dc=org -w test12

Add LDIF stuff: 

ldapadd -x -D cn=Manager,dc=t0e,dc=org -w secret
ldapmodify -x -D cn=Manager,dc=t0e,dc=org -w secret

Search: 

ldapsearch -x -b dc=t0e,dc=org
ldapsearch -x -b dc=t0e,dc=org memberof=cn=git,ou=groups,dc=t0e,dc=org

Member of - test: 

# check that 'memberOf' tag is included
ldapsearch -x -b dc=t0e,dc=org '(uid=kenneth)' memberOf

Member of - list users: 

ldapsearch -x -b dc=t0e,dc=org "(memberOf=cn=jirausers,ou=groups,dc=t0e,dc=org)"

References:

Build Libraries

----------------------------------------------------------------------
Libraries have been installed in:
   /opt/db/lib

If you ever happen to want to link against installed libraries
in a given directory, LIBDIR, you must either use libtool, and
specify the full pathname of the library, or use the `-LLIBDIR'
flag during linking and do at least one of the following:
   - add LIBDIR to the `LD_LIBRARY_PATH' environment variable
     during execution
   - add LIBDIR to the `LD_RUN_PATH' environment variable
     during linking
   - use the `-Wl,--rpath -Wl,LIBDIR' linker flag
   - have your system administrator add LIBDIR to `/etc/ld.so.conf'

See any operating system documentation about shared libraries for
more information, such as the ld(1) and ld.so(8) manual pages.
----------------------------------------------------------------------

Build Issues

Issue: 

configure: error: BDB/HDB: BerkeleyDB not available

Solution: 

yum install db4 db4-devel

Issues: 

configure: error: BerkeleyDB version incompatible with BDB/HDB backends

Solution:

  • /* require 4.4 or later */
  • Install a newer version of db4 or older bersion of openldap

Examples

Thunderbird contact example: 

dn: cn=Kenneth Burgener,mail=kenneth.burgener@oeey.com
objectclass: top
objectclass: person
objectclass: organizationalPerson
objectclass: inetOrgPerson
objectclass: mozillaAbPersonAlpha
givenName: Kenneth
sn: Burgener
cn: Kenneth Burgener
mail: kenneth.burgener@oeey.com
nsAIMid: kenneth.burgener@oeey.com
modifytimestamp: 0Z
telephoneNumber: (801) 852-0770 x113
homePhone: (801) 607-5789
mobile: (801) 830-8921
street: 274 West Center Street
l: Orem
st: UT
postalCode: 84057
mozillaWorkUrl: http://www.oeey.com

Moe Howard example from YOLinux 

dn: cn=Moe Howard, ou=MemberGroupA, o=stooges
homePhone: 800-555-1313
givenName: Moe
mobile: 800-555-1318
postalCode: 75226
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
userPassword:: bW9lc2VjcmV0
facsimileTelephoneNumber: 800-555-3318
ou: MemberGroupA
uid: moe
mail: MHoward@isp.com
cn: Moe Howard
initials: Bob
telephoneNumber: (800)555-1213
pager: 800-555-1319
manager: cn=Larry Howard,ou=MemberGroupA,o=stooges
destinationIndicator: /bios/images/mhoward.jpg
o: stooges
st: TX
l: Dallas
postalAddress: 216 South Fitzhugh Ave.
sn: Howard
homePostalAddress: 16 Cherry Ln.$Plano TX 78888
title: Manager of Product Development

LDAP Mail

LDAP GUI Management and Administration

Softerra LDAP Administrator & Browser: Directory Management Tool for Windows - http://www.ldapbrowser.com/

  • Excellent tool!
  • "Why you need LDAP Administrator":
    • Can you visually and intuitively modify your LDAP directory without using command line utilities but still having all the advantages and power of Windows GUI?
    • Can you access OpenLDAP, Netscape/iPlanet, Novell eDirectory, Oracle Internet Directory, Lotus Domino or Microsoft Active Directory with just one tool?
    • Can you quickly manage and navigate throughout your directory regardless of its huge size and hierarchical complexity?
    • Have you got a tool that uses LDIF import and export as efficiently to maintain your directory in good working order eliminating all sorts of data corruption risks (for you'll always be able to restore information from backup)?

JXplorer - an open source ldap browser - http://jxplorer.org/

  • Good, but major flaw: LDAPS fails frequently due to unaccepted certificate. Haven't found a way to override.
  • JXplorer is an open source ldap browser originally developed by Computer Associates' eTrust Directory development lab. It is a standards compliant general purpose ldap browser that can be used to read and search any ldap directory, or any X500 directory with an ldap interface. It is available for immediate free download under a standard OSI-style open source licence.

LDAP Admin: Overview - http://ldapadmin.sourceforge.net/

  • "Ldap Admin is free Windows administration tool for LDAP directory management. This application lets you browse, search, modify, create and delete objects on LDAP server. It also supports more complex operations such as directory copy and move between remote servers and extends the common edit functions to support specific object types (such as groups and accounts)."

Web Interface

LDAP Account Manager - https://www.ldap-account-manager.org/lamcms/

Users and Computers — Zentyal 3.4 Documentation - http://doc.zentyal.org/en/directory.html

Easy-to-use LDAP editor - Software Recommendations Stack Exchange - http://softwarerecs.stackexchange.com/questions/1055/easy-to-use-ldap-editor

  • LDAP Admin - Windows
  • jXplorer - Java Based
  • Apache Directory Studio - Java based

GOsa - https://oss.gonicus.de/labs/gosa

Password Change Web Application

pwm - Open Source Password Self Service for LDAP directories - Google Project Hosting - http://code.google.com/p/pwm/

keywords

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