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Lightweight Directory Access Protocol (LDAP)

Protocol BasicsDirectory StructureIdentifiers and AttributesSearch and QueryReal-World Implementations

LDAP (Lightweight Directory Access Protocol) is a protocol used for accessing and managing directory information services over an IP network. It organizes data in a hierarchical structure, similar to a file system, and is widely used for managing users, groups, and other directory entries.

Key Points

  • Directory Structure: LDAP directories are structured as objects, each with a unique Distinguished Name (DN).
  • Hierarchical Organization: The hierarchy starts with a top-level domain (TLD) and includes organizational units (OUs) and entries.
  • Efficient Search: LDAP uses filters and search queries to locate and retrieve information efficiently.

Directory Structure

LDAP directories are organized in a tree-like structure, where each entry is uniquely identified by a Distinguished Name (DN). This structure allows for efficient management and retrieval of information.

Hierarchical Organization

The hierarchy of an LDAP directory typically includes:

  • Top-Level Domain (TLD): The root of the directory.
  • Organizational Units (OUs): Sub-divisions within the directory.
  • Entries: Individual items within the directory, such as users or groups.

Search and Query

LDAP uses filters to perform searches within the directory. These filters can be simple or complex, allowing for precise retrieval of information.

Example: An LDAP query to find all users with names starting with "J" in the "people" organizational unit:

(cn=J*)

Real-World Application

Microsoft Active Directory uses LDAP to manage user credentials and permissions within an organization. This ensures secure and efficient management of directory services.

Key Takeaways

  • LDAP is crucial for directory services like Active Directory and OpenLDAP.
  • Entries are uniquely identified by Distinguished Names (DNs).
  • LDAP queries use filters to search and retrieve directory information.

Learn More

For further reading on LDAP, consider exploring resources on:

  • Active Directory: How it integrates with LDAP for user management.
  • OpenLDAP: An open-source implementation of the LDAP protocol.
  • LDAP Filters: Advanced techniques for constructing efficient search queries.