How do I add olcAuditLogConfig to openldap on Centos 6

Question

Regarding to 'man slapo-auditlog' I should just need to add the following.

dn: olcOverlay=auditlog,olcDatabase={1}hdb,cn=config
changetype: add
objectClass: olcOverlayConfig
objectClass: olcAuditLogConfig
olcOverlay: auditlog
olcAuditlogFile: /tmp/auditlog.ldif

First the "olcOverlay=auditlog" is not installed by default on Centos 6. So i cant add this to anything. If I remove "changetype: add" I will get this error.

additional info: objectClass: value #1 invalid per syntax

I found out that I could create my own cn=module, and after that olcAuditLogConfig existed, and I could execute the above LDIF. But I still don't get any auditlogs.

dn: cn=module{0},cn=config
objectClass: olcModuleList
cn: module{0}
olcModulePath: /usr/lib64/openldap/
olcModuleLoad: auditlog.la

My LDAP-setup can be found here (now slightly modified on my own server)

How do I configure LDAP on Centos 6 for user authentication in the most secure and correct way?

Answer 1

I have now got everything to work and I was very close to the solution. It was a permission problem. This is how you add the auditlog to openldap installed on Centos 6.

First enable the module.

ldapadd -H ldaps://ldap.example.net -x -D "cn=admin,cn=config" -w secret << EOF
dn: cn=module{0},cn=config
objectClass: olcModuleList
cn: module{0}
olcModulePath: /usr/lib64/openldap/
olcModuleLoad: auditlog.la
EOF

Setup a folder where ldap has permission to write.

mkdir slapd
chmod 755 /var/log/slapd/
chown ldap:ldap /var/log/slapd/
ls -alvhZ /var/log/slapd/

And then configure the olcAuditLogConfig overlay.

ldapadd -H ldaps://ldap.example.net -x -D "cn=admin,cn=config" -w secret << EOF
dn: olcOverlay=auditlog,olcDatabase={1}bdb,cn=config
changetype: add
objectClass: olcOverlayConfig
objectClass: olcAuditLogConfig
olcOverlay: auditlog
olcAuditlogFile: /var/log/slapd/auditlog.log
EOF

Insert something to the database.

ldapadd -H ldaps://ldap.example.net -x -D "cn=admin,cn=config" -w secret << EOF
dn: cn=management11191,ou=group,dc=example,dc=net
cn: management11191
objectClass: posixGroup
gidNumber: 2005
memberUid: user1
memberUid: user3
EOF

And check the auditlog file, if you see any contents it works.

$ cat /var/log/slapd/auditlog.log
...
$ ls -alvhZ  /var/log/slapd/auditlog.log
-rw-r--r--. ldap ldap unconfined_u:object_r:slapd_log_t:s0 /var/log/slapd/auditlog.log

Answer 2

1. You need to install the openldap-servers-overlays package:

   Name       : openldap-servers-overlays
   Arch       : x86_64
   Version    : 2.3.43
   Release    : 12.el5_7.9
   Size       : 358 k
   Repo       : installed
   Summary    : Overlays for OpenLDAP server.
   URL        : http://www.openldap.org/
   License    : OpenLDAP
   Description: 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.
              : 
              : This package contains overlay modules for OpenLDAP server daemon.
   

2. Uncomment the auditlog module in slapd.conf:

   modulepath  /usr/lib64/openldap
   moduleload auditlog.la
   

3. Specify the auditlog file:

   database    bdb
   
   overlay     auditlog
   auditlog    /tmp/audit.log
   
   suffix      "dc=domain,dc=com"
   rootdn      "cn=Manager,dc=domain,dc=com"
   

4. Modify/add some values to the attributes and take a look at the above log, you will see something like this:

   # modify 1319524581 dc=domain,dc=com cn=Manager,dc=domain,dc=com
   dn: cn=xx,ou=yy,dc=domain,dc=com
   changetype: modify
   replace: initials
   initials: Hai
   initials: Do
   -
   replace: entryCSN
   entryCSN: 20111025063621Z#000000#00#000000
   -
   replace: modifiersName
   modifiersName: cn=Manager,dc=domain,dc=com
   -
   replace: modifyTimestamp
   modifyTimestamp: 20111025063621Z
   -
   # end replace 1319524581