Difference between revisions of "User:Alexmat"

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= Secure OpenLDAP Autentication for a Small Network =
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[http://wiki.archlinux.org/index.php/User:Alexmat:Secure_OpenLDAP_Authentication_for_a_Small_Network Secure OpenLDAP Authentication for a Small Network]
  
== Introduction and Concepts ==
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[http://wiki.archlinux.org/index.php/User:Alexmat:Network_File_System_Setup Network File System Setup]
  
This guide is composed from bits and pieces of LDAP guides and forums around the net. I borrowed very heavily from Eliott's (cactus) OpenLDAP guide [[http://solarblue.net/docs/ldap.htm Ldap Server Setup]] which is very well written. Unfortunately Arch Linux has some differences in the way things are setup. It is also the case that most LDAP guides online fall into one of 3 categories: too general, outdated or uses distro specific tools (i.e. authconfig). This guide is written specifically with Arch linux in mind and will try to illustrate both LDAP concepts and implementaion from the point of view of someone who has never used LDAP before (i.e. the author).
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[http://wiki.archlinux.org/index.php/User:Alexmat:Auto_File_System_Mounter Auto File System Mounter]
  
=== OpenLDAP ===
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[http://wiki.archlinux.org/index.php/User:Alexmat:Manual_CK_Kernel_Install Manual CK Kernel Install]
  
UNDER CONSTRUCTION!
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[http://wiki.archlinux.org/index.php/User:Alexmat:Network_Time_Protocol_Daemon Network Time Protocol Daemon]
  
=== NSS and PAM ===
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[http://wiki.archlinux.org/index.php/User:Alexmat:Jabberd_Setup Jabberd Setup]
 
 
UNDER CONSTRUCTION!
 
 
 
== Server Setup ==
 
 
 
=== Install OpenLDAP ===
 
 
 
pacman -Sy openldap
 
 
 
 
 
=== Configure OpenLDAP ===
 
 
 
Generate root password:
 
 
 
slappasswd -h {SSHA}
 
 
 
Edit /etc/openldap/slapd.conf
 
  EXPAND ON THIS
 
 
 
Start OpenLDAP:
 
 
 
/etc/rc.d/slapd start
 
 
 
 
 
=== Populate LDAP Tree with Base Data ===
 
 
 
Create a file called base.ldif with the following text:
 
 
 
# example.org
 
dn: dc=example,dc=org
 
objectClass: dcObject
 
objectClass: organization
 
o: Example Organization
 
dc: example.org
 
 
# admin, example.org
 
dn: cn=admin,dc=example,dc=org
 
cn: admin
 
description: LDAP administrator
 
roleOccupant: dc=example,dc=org
 
objectClass: organizationalRole
 
objectClass: top
 
 
# People, example.org
 
dn: ou=People,dc=example,dc=org
 
ou: People
 
objectClass: top
 
objectClass: organizationalUnit
 
 
# Group, example.org
 
dn: ou=Group,dc=example,dc=org
 
ou: Group
 
objectClass: top
 
objectClass: organizationalUnit
 
 
 
Add it to your OpenLDAP Tree:
 
 
 
ldapadd -x -D "cn=admin,dc=example,dc=org" -W -f base.ldif
 
 
 
Test to make sure the data was imported:
 
 
 
ldapsearch -x -b 'dc=example,dc=com' '(objectclass=*)'
 
 
 
 
 
=== Configure TLS Encryption ===
 
 
 
It's a good idea to configure TLS to encrypt the exchange of information between client and server. This way passwords, which are normally sent plain-text, cannot be easily sniffed from the wire. In order to use TLS, we must first create a certificate. You can have a certificate signed, or create your own Certificate Authority (CA), but for our purposed, a self-signed certificate will suffice. '''IMPORTANT:''' OpenLDAP cannot use a certificate that has a password associated to it.
 
 
 
To create a ''self-signed'' certificate, type the following:
 
 
 
openssl req -new -x509 -nodes -out slapdcert.pem -keyout slapdkey.pem -days 365
 
 
 
You will be prompted for information about your ldap server. Much of the information can be left blank. The most important information is the common name. This must be set to the DNS name of your ldap server. If your LDAP server's IP address resolves to example.org but its server certificate shows a CN of bad.example.org, LDAP clients will reject the certificate and will be unable to negotiate TLS connections (apparently the results are wholly unpredictable).
 
 
 
Now that the certificate files have been created copy them to /etc/openldap/ssl/ (if this directory doesn't exist create it) and secure them. '''IMPORTANT:''' slapdcert.pem must be world readable because it contains the public key.
 
 
 
cp slapdcert.pem slapdkey.pem /etc/openldap/ssl/
 
chmod 400 slapdkey.pem
 
chmod 444 slapdcert.pem
 
 
 
Edit the daemon configuration file (/etc/openldap/slapd.conf) to tell LDAP where the certificate files reside by adding the following lines:
 
 
 
# Certificate/SSL Section
 
TLSCipherSuite HIGH:MEDIUM:+SSLv2
 
TLSCertificateFile /etc/openldap/ssl/slapdcert.pem
 
TLSCertificateKeyFile /etc/openldap/ssl/slapdkey.pem
 
 
 
The TLSCipherSuite specifies a list of OpenSSL ciphers from which slapd will choose when negotiating TLS connections, in decreasing order of preference. In addition to those specific ciphers, you can use any of the wildcards supported by OpenSSL. '''NOTE:''' HIGH, MEDIUM, and +SSLv2 are all wildcards.
 
 
 
To see which ciphers are supported by your local OpenSSL installation, type the following:
 
 
 
openssl ciphers -v ALL
 
 
 
In order to tell OpenLDAP to start using encryption edit /etc/rc.d/slapd and change
 
 
 
stat_busy "Starting OpenLDAP"
 
    [ -z "$PID" ] && /usr/sbin/slapd
 
 
 
to
 
 
 
stat_busy "Starting OpenLDAP"
 
    [ -z "$PID" ] && `/usr/sbin/slapd -h ldaps:///`
 
 
 
This will cause OpenLDAP to accept encrypted. '''IMPORTANT:''' If you created a self-signed certificate above be sure to add the following line to /etc/openldap/ldap.conf or you won't be able connect to the server to test it:
 
 
 
TLS_REQCERT allow
 
 
 
Restart the server:
 
 
 
/etc/rc.d/slapd restart
 
 
 
Test that the server is encrypting traffic run the following command:
 
 
 
ldapsearch -x -H ldaps://example.org -b 'dc=example,dc=org' '(objectclass=*)'
 
 
 
 
 
== Client Setup ==
 
 
 
=== OpenLDAP ===
 
 
 
'''IMPORTANT:''' If you created a self-signed certificate above be sure to add the following line to /etc/openldap/ldap.conf or you won't be able connect to the server:
 
 
 
TLS_REQCERT allow
 
 
 
 
 
=== NSS_LDAP ===
 
 
 
UNDER CONSTRUCTION!
 
 
 
 
 
=== PAM_LDAP ===
 
 
 
UNDER CONSTRUCTION!
 
 
 
 
 
=== Name Service Cache Deamon ===
 
 
 
READ THIS FIRST: [[http://bbs.archlinux.org/viewtopic.php?t=9401 NSCD Bugged in Arch Linux]]
 
 
 
 
 
== Links and Resources ==
 
 
 
Eliott's (cactus) guide for a RedHat Server: [[http://solarblue.net/docs/ldap.htm Ldap Server Setup]]
 
 
 
One of the best OpenLDAP clients: [[http://phpldapadmin.sourceforge.net/ phpLDAPadmin]]
 
 
 
Debian OpenLDAP setup: [[http://www.fatofthelan.com/articles/articles.php?pid=24 Using LDAP for single authentication]]
 
 
 
How to integrate OpenLDAP for MacOSX, Windows and Linux: [[http://www.cs.dixie.edu/ldap/ Heterogeneous Network Authentication Introduction]]
 

Latest revision as of 00:59, 18 September 2005