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What does an LDAP filter look like and how do I build one?

#1
09-12-2024, 11:39 PM
An LDAP filter typically looks like a string of logical conditions that you use to isolate specific entries in a directory. It consists of a base string which identifies the attribute(s) you're interested in and logical operators like &, |, and ! to build more complex searches. For example, if you want to find users based on their names, you might create a filter like "(cn=John*)". This filter looks for any entry with a common name that starts with "John".

To build your own filter, start by determining the attributes relevant to what you're searching for. Think about what you want to filter on, like user roles or department names. Use parentheses to group your conditions. If you want to find users in the "IT" department who are active, you might build a filter like "(&(objectClass=user)(department=IT)(userStatus=active))".

Experiment with different operators for more complex searches. For instance, you can use "|" to express "or" conditions. If you also want to include "HR" users, you could add that to your filter: "(&(objectClass=user)(|(department=IT)(department=HR)))".

Sometimes, you'll want to make your filters dynamic as you get more familiar with LDAP queries. Tools like LDAP browsers let you test these filters in real-time, which is super helpful when you're just starting. Try to focus on the attributes that really matter for your use case.

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steve@backupchain
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Joined: Jul 2018
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