LDAP URLs have the following syntax:
ldap[s]://hostname:port/base_dn?attributes?scope?filter
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When ldap:// is specified, standard LDAP is used to connect to the LDAP servers. When ldaps:// is specified, LDAP over SSL is used to connect to the LDAP server.
Table 3-1 LDAP URL Components
Component
Description
hostname
Name (or IP address in dotted format) of the LDAP server. For example:
ldap.example.com or 192.168.1.100
port
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Port number of the LDAP server.
If no port is specified, the standard LDAP port (389) or LDAPS port (636) is used.
base_dn
Distinguished name (DN) of an entry in the directory. This DN identifies the entry that is the starting point of the search.
If no base DN is specified, the search starts at the root of the directory tree.
attributes
The attributes to be returned. To specify more than one attribute, use commas to separate the attributes. For example, “cn,mail,telephoneNumber”.
If no attributes are specified in the URL, all attributes are returned.
scope
The scope of the search. The scope can be one of these values:
-
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base retrieves information about the distinguished name (base_dn) specified in the URL only.
-
one retrieves information about entries one level below the distinguished name (base_dn) specified in the URL. The base entry is not included in this scope.
-
sub retrieves information about entries at all levels below the distinguished name (base_dn) specified in the URL. The base entry is included in this scope.
If no scope is specified, the server performs a base search.
filter
Search filter to apply to entries within the specified scope of the search.
If no filter is specified, the server uses the filter objectClass=*.
The following components are identified by their positions in the URL: attributes, scope, and filter are. If you do not want to specify a component, you must include a question mark to delimit the field. Two consecutive question marks, ??, indicate that no attributes have been specified.
For example, to specify a subtree search starting from “dc=example,dc=com” that returns all attributes for entries matching “(sn=Jensen)”, use the following LDAP URL.
ldap://ldap.example.com/dc=example,dc=com??sub?(sn=Jensen)
Because no specific attributes are identified in the URL, all attributes are returned in the search.
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