LDAP

LDAP is the Lightweight Directory Access Protocol.

Glossary

CN = Common Name
- ???
DN = Distinguished Name
- The full path of an object, like an URL/URI, e.g.: uid=jdoe,cn=users,dc=example,dc=com
UID = User Identification
- The 'username'

ldapsearch

ldapsearch is a command line tool, to search through a LDAP directory.

Basic structure for basic auth

ldapsearch -D <Bind DN> -x -H <LDAP server URI> -W -b <Base DN> <filter> <attributes>

Parameter	Explanation
`-D <Bind DN>`	The object (user/account) to connect to the LDAP server. Is limited to their rights.
`-x`	Use basic auth.
`-H <LDAP server URI>`	The URI of the server to connect to, e.g.: ldaps://example.com
`-W`	Ask for the basic auth password on the command line.
`-b <Base DN>`	Where to start searching for the object, e.g.: cn=users,dc=example,dc.com
`<filter>`	Defines, which object(s) to search for. (Examples below)
`<attributes>`	Defines, which attributes you want to see of the objects. (Examples below)

Filter examples

Search for all groups where someone is a member

member=uid=jdoe,cn=users,dc=example,dc=com
uniqueMember=uid=jdoe,cn=users,dc=example,dc=com
memberUid=jdoe
member=sAMAccountName=jdoe,cn=users,dc=example,dc=com  # To be checked

Also there's the memberOf attribute, which is attached to an object. It can be there multiple times and shows all the groups the object is memeber of.

Search for a specific user

uid=jdoe
sAMAccountName=jdoe

It's noteworthy that you should combine this search with a fitting -b <Base DN>, e.g. cn=users,dc=example,dc=com.

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