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1. Uses the LDAP server administrator DN to bind with the LDAP server. After the binding is
created, the client establishes a connection to the server and obtains the right to search.
2. Constructs search conditions by using the username in the authentication information of a user.
The specified root directory of the server is searched and a user DN list is generated.
3. Binds with the LDAP server by using each user DN and password. If a binding is created, the
user is considered legal.
In LDAP authorization, the client performs the same tasks as in LDAP authentication. When the
client constructs search conditions, it obtains both authorization information and the user DN list.
Basic LDAP authentication process
The following example illustrates the basic LDAP authentication process for a Telnet user.
Figure 7 Basic LDAP authentication process for a Telnet user
The following shows the basic LDAP authentication process:
1. A Telnet user initiates a connection request and sends the username and password to the
LDAP client.
2. After receiving the request, the LDAP client establishes a TCP connection with the LDAP
server.
3. To obtain the right to search, the LDAP client uses the administrator DN and password to send
an administrator bind request to the LDAP server.
4. The LDAP server processes the request. If the bind operation is successful, the LDAP server
sends an acknowledgment to the LDAP client.
5. The LDAP client sends a user DN search request with the username of the Telnet user to the
LDAP server.
6. After receiving the request, the LDAP server searches for the user DN by the base DN, search
scope, and filtering conditions. If a match is found, the LDAP server sends a response to notify
the LDAP client of the successful search. There might be one or more user DNs found.
7. The LDAP client uses the obtained user DN and the entered user password as parameters to
send a user DN bind request to the LDAP server. The server will check whether the user
password is correct.
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