OpenLDAP

Download Source:	ftp://ftp.openldap.org/pub/OpenLDAP/openldap-release/openldap-2.4.19.tgz

---

Introduction to OpenLDAP

The OpenLDAP package provides an open source implementation of the Lightweight Directory Access Protocol.

Project Homepage: http://www.openldap.org/

Note

This page contains instructions to compile a OpenLDAP Server, Most of the time it is only the client libraries that are required, you can find this information on the OpenLDAP-Client page.

Dependencies

Required

• Berkeley DB or GDBM

Recommended

• CyrusSASL
• OpenSSL

Optional

• TCP Wrappers
• unixODBC
• GNU Pth
• OpenSLP

Configuration Information

If you really want to build OpenLDAP with GNU Database Manager instead of Berkeley DB, add the following flags to configure script:

--disable-bdb --disable-hdb --with-ldbm-api=gdbm

Non-Multilib

Compile the package:

sed -i 's@\(^STRIP = \).*@\1 @' build/top.mk &&
CPPFLAGS="-D_GNU_SOURCE" ./configure --prefix=/usr --sysconfdir=/etc \
    --libexecdir=/usr/lib/openldap --localstatedir=/srv/ldap --disable-debug \
    --enable-dynamic --enable-crypt --enable-modules --enable-wrappers \
    --enable-bdb=mod --enable-hdb=mod --enable-ldap=mod \
    --enable-monitor=mod --enable-perl=mod --enable-relay=mod \
    --enable-dyngroup=mod --enable-dynlist=mod --enable-memberof=mod \
    --enable-ppolicy=mod --enable-valsort=mod &&
make depend &&
make

Install the package

make install &&
ln -sv ../lib/openldap/slapd /usr/sbin/slapd &&
install -dv -m755 /usr/share/doc/openldap-2.4.19/{drafts,guide,rfc} &&
install -v -m644 doc/drafts/* /usr/share/doc/openldap-2.4.19/drafts &&
install -v -m644 doc/rfc/*    /usr/share/doc/openldap-2.4.19/rfc &&
cp -Rv doc/guide/*          /usr/share/doc/openldap-2.4.19/guide

Multilib

32Bit

Compile the package:

sed -i 's@\(^STRIP = \).*@\1 @' build/top.mk &&
CC="gcc ${BUILD32}" CPPFLAGS="-D_GNU_SOURCE" ./configure --prefix=/usr --sysconfdir=/etc \
    --libexecdir=/usr/lib/openldap --localstatedir=/srv/ldap --disable-debug \
    --enable-dynamic --enable-crypt --enable-modules --enable-wrappers \
    --enable-bdb=mod --enable-hdb=mod --enable-ldap=mod \
    --enable-monitor=mod --enable-perl=mod --enable-relay=mod \
    --enable-dyngroup=mod --enable-dynlist=mod --enable-memberof=mod \
    --enable-ppolicy=mod --enable-valsort=mod &&
make depend &&
make

Install the package

make install

N32

Compile the package:

sed -i 's@\(^STRIP = \).*@\1 @' build/top.mk &&
CC="gcc ${BUILDN32}" CPPFLAGS="-D_GNU_SOURCE" ./configure --prefix=/usr --sysconfdir=/etc \
    --libexecdir=/usr/lib/openldap --localstatedir=/srv/ldap --disable-debug \
    --enable-dynamic --enable-crypt --enable-modules --enable-wrappers \
    --enable-bdb=mod --enable-hdb=mod --enable-ldap=mod \
    --enable-monitor=mod --enable-perl=mod --enable-relay=mod \
    --enable-dyngroup=mod --enable-dynlist=mod --enable-memberof=mod \
    --enable-ppolicy=mod --enable-valsort=mod &&
make depend &&
make

Install the package

make install

64Bit

Compile the package:

sed -i 's@\(^STRIP = \).*@\1 @' build/top.mk &&
CC="gcc ${BUILD64}" CPPFLAGS="-D_GNU_SOURCE" ./configure --prefix=/usr \
    --sysconfdir=/etc --libdir=/usr/lib64 --libexecdir=/usr/lib/openldap \
    --localstatedir=/srv/ldap --disable-debug \
    --enable-dynamic --enable-crypt --enable-modules --enable-wrappers \
    --enable-bdb=mod --enable-hdb=mod --enable-ldap=mod \
    --enable-monitor=mod --enable-perl=mod --enable-relay=mod \
    --enable-dyngroup=mod --enable-dynlist=mod --enable-memberof=mod \
    --enable-ppolicy=mod --enable-valsort=mod &&
make depend &&
make

Install the package

make install &&
ln -sv ../lib/openldap/slapd /usr/sbin/slapd &&
install -dv -m755 /usr/share/doc/openldap-2.4.19/{drafts,guide,rfc} &&
install -v -m644 doc/drafts/* /usr/share/doc/openldap-2.4.19/drafts &&
install -v -m644 doc/rfc/* /usr/share/doc/openldap-2.4.19/rfc &&
cp -Rv doc/guide/* /usr/share/doc/openldap-2.4.19/guide

Configuring

The information in the sections below are based off information from the following pages:

http://www.bayour.com/LDAPv3-HOWTO.html
http://aput.net/~jheiss/krbldap/

Additional Steps with Kerberos

If you plan on using LDAP with Kerberos you will need to create the LDAP Service Principle in the Kerberos database. You will also want to create a keytab for LDAP and LDAP alone.

kadmin.local -q "addprinc -randkey ldap/<fqdn of ldap server>@<REALMNAME.COM>" &&
kadmin.local -q "ktadd -k /etc/openldap/slapd.keytab ldap/<fqdn of ldap server>@<REALMNAME.COM>" &&
chmod 600 /etc/openldap/slapd.keytab

You will also need to add the LDAP Service Principle to the system keytab aswell:

kadmin.local -q "ktadd -k /etc/krb5.keytab ldap/<fqdn of ldap server>@<REALMNAME.COM>" &&
chmod 600 /etc/krb5.keytab

The slapd binary in /usr/sbin should be a symlink. Remove it and put a wrapper script that will point ldap at the proper keytab in its place:

rm /usr/sbin/slapd &&
cat > /usr/sbin/slapd << "EOF"
#!/bin/sh
# Kerberos Wrapper Script for Slapd
if [ -f /etc/openldap/ldap.keytab ]; then
  env KRB5_KTNAME=/etc/openldap/slapd.keytab /usr/lib/openldap/slapd "$@"
else
  /usr/lib/openldap/slapd "$@"
fi
EOF

chmod +x /usr/sbin/slapd

You also will want to create a user specifically for managing the ldap directory:

kadmin.local -q "addprinc ldapadm@<REALMNAME.COM>"

slapd.conf

If you download the following schema files to the ldap schema directory you can remove the comments on the corresponding lines:

http://cross-lfs.org/~jciccone/ldap-schemas/krb5-kdc.schema
http://cross-lfs.org/~jciccone/ldap-schemas/sudo.schema

Creating a basic slapd configuration file:

cat > /etc/openldap/slapd.conf << "EOF"
# Begin /etc/openldap/slapd.conf

# Schema Definitions
include /etc/openldap/schema/core.schema
include /etc/openldap/schema/cosine.schema
include /etc/openldap/schema/inetorgperson.schema
include /etc/openldap/schema/nis.schema
#include /etc/openldap/schema/sudo.schema
include /etc/openldap/schema/misc.schema
#include /etc/openldap/schema/krb5-kdc.schema

# The location of the PID file
pidfile /srv/ldap/run/slapd.pid

# List of arguments that will be passed to the server
argsfile /srv/ldap/run/slapd.args

# Load dynamic backend modules:
modulepath /usr/lib/openldap/openldap
moduleload back_bdb.la
#moduleload back_ldap.la
#moduleload back_ldbm.la
#moduleload back_passwd.la
#moduleload back_shell.la

# Use crypt to hash the passwords
password-hash {crypt}

# If you wish to use cyrus-sasl to bind to
# Kerberos uncomment and configure the
# following lines
#sasl-realm <REALMNAME.COM>
#sasl-host <FQDN OF SASL SERVER>
#sasl-secprops none

# Map the kerberos principals to actual ldap entities.
#authz-policy from
#authz-regexp "^uid=([^,]+),cn=<realm>,cn=gssapi,cn=auth" "uid=$1,ou=people,<BASE DN>"

# Define SSL and TLS properties (optional)
#TLSCertificateFile /etc/ssl/ldap.pem
#TLSCertificateKeyFile /etc/openldap/ldap-key.pem
#TLSCACertificateFile /etc/ssl/ldap.pem 

#######################################################################
# Access Lists
#######################################################################

access to attrs=userPassword
  by dn="cn=Manager,<BASE DN>" write
#  by dn="uid=ldapadm,ou=people,<BASE DN>" write
  by dn="uid=root,ou=people,<BASE DN>" write
  by self write
  by anonymous auth
  by * none

access to attrs=gecos,description,loginShell
  by self write

access to *
  by dn="cn=Manager,<BASE DN>" write
#  by dn="uid=ldapadm,ou=people,<BASE DN>" write
  by dn="uid=root,ou=people,<BASE DN>" write
  by * read
  by * search

#######################################################################
# BDB database definitions
#######################################################################

database bdb
suffix "<BASEDN>"

# By Default the rootdn always has complete access to the entire ldap directory regardless of ACLs
# It is for this reason that after the database is populated, you disable the rootdn by either
# removing or commenting out the following 2 lines.
rootdn "cn=Manager,<BASEDN>"
rootpw <password hash>

directory "/srv/ldap/openldap-data"

# Indexes
index default pres,eq
index objectClass,uid,uidnumber,gidnumber,cn
index mail eq

# End /etc/openldap/slapd.conf
EOF

When creating the configuration file above replace <BASEDN> with your Base DN. eg. dc=cross-lfs,dc=org.

You can generate a password hash for the rootdn with the following command:

slappasswd -h {SHA}

Bootscript

Install the init script included in the bootscripts package.

make install-openldap1

Note

The bootscript openldap1 only starts slapd. openldap2 starts slapd and slurpd.

Populating the Directory

Before continuing with the following, start the ldap service:

/etc/rc.d/init.d/openldap start

Creating an initial LDIF:

cat > entries.ldif << "EOF"
# Organization for Example Corporation
dn: <BASEDN>
objectClass: dcObject
objectClass: organization
dc: example
o: Example Corporation
description: The Example Corperation

# Organizational Role for Directory Manager
dn: cn=Manager,<BASEDN>
objectClass: organizationalRole
cn: Manager
description: Directory Manager
EOF

Adding the entries into the LDAP directory:

ldapadd -f entries.ldif -x -D "cn=Manager,<BASEDN>" -W

Where to go from here?

Configuring clients to authenticate against LDAP, and possibly Kerberos

The nss_ldap page contains information on creating some base OUs (Organizational Units) and starting to create your users and groups.