This module lets the server administrator automatically populate users’ rosters (contact lists) with entries based on users and groups defined in an LDAP-based directory.
The module accepts the following configuration parameters. Some of them, if unspecified, default to the values specified for the top level of configuration. This lets you avoid specifying, for example, the bind password, in multiple places.
These parameters specify LDAP filters used to query for shared roster information. All of them are run against theldap_base.
ldap_rfilter
So called "Roster Filter”. Used to find names of all "shared roster” groups. See also the ldap_groupattr parameter. If unspecified, defaults to the top-level parameter of the same name. You must specify it in some place in the configuration, there is no default.
ldap_ufilter
"User Filter” – used for retrieving the human-readable name of roster entries (usually full names of people in the roster). See also the parameters ldap_userdesc and ldap_useruid. If unspecified, defaults to the top-level parameter of the same name. If that one also is unspecified, then the filter is assembled from values of other parameters as follows ([ldap_SOMETHING] is used to mean "the value of the configuration parameter ldap_SOMETHING”):
Subsequently %u and %g are replaced with a *. This means that given the defaults, the filter sent to the LDAP server is would be (&(memberUid=*)(cn=*)). If however the ldap_memberattr_format is something likeuid=%u,ou=People,o=org, then the filter will be (&(memberUid=uid=*,ou=People,o=org)(cn=*)).
ldap_gfilter
"Group Filter” – used when retrieving human-readable name (a.k.a. "Display Name”) and the members of a group. See also the parameters ldap_groupattr, ldap_groupdesc and ldap_memberattr. If unspecified, defaults to the top-level parameter of the same name. If that one also is unspecified, then the filter is constructed exactly in the same way asUser Filter.
ldap_filter
Additional filter which is AND-ed together with User Filter and Group Filter. If unspecified, defaults to the top-level parameter of the same name. If that one is also unspecified, then no additional filter is merged with the other filters.
Note that you will probably need to manually define the User and Group Filters (since the auto-assembled ones will not work) if:
your ldap_memberattr_format is anything other than a simple %u,
and the attribute specified with ldap_memberattr does not support substring matches.
An example where it is the case is OpenLDAP and (unique)MemberName attribute from the groupOf(Unique)NamesobjectClass. A symptom of this problem is that you will see messages such as the following in your slapd.log:
These parameters specify the names of the attributes which hold interesting data in the entries returned by running filters specified in section 3.3.23.
ldap_groupattr
The name of the attribute that holds the group name, and that is used to differentiate between them. Retrieved from results of the "Roster Filter” and "Group Filter”. Defaults to cn.
ldap_groupdesc
The name of the attribute which holds the human-readable group name in the objects you use to represent groups. Retrieved from results of the "Group Filter”. Defaults to whatever ldap_groupattr is set.
ldap_memberattr
The name of the attribute which holds the IDs of the members of a group. Retrieved from results of the "Group Filter”. Defaults to memberUid.
The name of the attribute differs depending on the objectClass you use for your group objects, for example:
posixGroup → memberUid
groupOfNames → member
groupOfUniqueNames → uniqueMember
ldap_userdesc
The name of the attribute which holds the human-readable user name. Retrieved from results of the "User Filter”. Defaults to cn.
ldap_useruid
The name of the attribute which holds the ID of a roster item. Value of this attribute in the roster item objects needs to match the ID retrieved from the ldap_memberattr attribute of a group object. Retrieved from results of the "User Filter”. Defaults to cn.
These paramters control the behaviour of the module.
ldap_memberattr_format
A globbing format for extracting user ID from the value of the attribute named by ldap_memberattr. Defaults to %u, which means that the whole value is the member ID. If you change it to something different, you may also need to specify the User and Group Filters manually — see section 3.3.23.
ldap_memberattr_format_re
A regex for extracting user ID from the value of the attribute named by ldap_memberattr.
An example value "CN=(\\w*),(OU=.*,)*DC=company,DC=com" works for user IDs such as the following:
or the re module in unavailable in the current Erlang environment,
or the regular expression does not compile,
then instead of a regular expression, a simple format specified by ldap_memberattr_format is used. Also, in the last two cases an error message is logged during the module initialization.
Also, note that in all cases ldap_memberattr_format (and not the regex version) is used for constructing the default "User/Group Filter” — see section 3.3.23.
ldap_auth_check
Whether the module should check (via the ejabberd authentication subsystem) for existence of each user in the shared LDAP roster. See section 3.3.23 form more information. Set to off if you want to disable the check. Defaults to on.
ldap_user_cache_validity
Number of seconds for which the cache for roster item full names is considered fresh after retrieval. 300 by default. See section 3.3.23 on how it is used during roster retrieval.
ldap_group_cache_validity
Number of seconds for which the cache for group membership is considered fresh after retrieval. 300 by default. See section 3.3.23 on how it is used during roster retrieval.
The module also accepts the connection parameters, all of which default to the top-level parameter of the same name, if unspecified. See 3.2.5 for more information about them.
When the module is called to retrieve the shared roster for a user, the following algorithm is used:
A list of names of groups to display is created: the Roster Filter is run against the base DN, retrieving the values of the attribute named by ldap_groupattr.
Unless the group cache is fresh (see the ldap_group_cache_validity option), it is refreshed:
Information for all groups is retrieved using a single query: the Group Filter is run against the Base DN, retrieving the values of attributes named by ldap_groupattr (group ID), ldap_groupdesc (group "Display Name”) and ldap_memberattr (IDs of group members).
group "Display Name”, read from the attribute named by ldap_groupdesc, is stored in the cache for the given group
the following processing takes place for each retrieved value of attribute named by ldap_memberattr:
the user ID part of it is extracted using ldap_memberattr_format(_re),
then (unless ldap_auth_check is set to off) for each found user ID, the module checks (using theejabberd authentication subsystem) whether such user exists in the given virtual host. It is skipped if the check is enabled and fails.
This step is here for historical reasons. If you have a tidy DIT and properly defined "Roster Filter” and "Group Filter”, it is safe to disable it by setting ldap_auth_check to off — it will speed up the roster retrieval.
the user ID is stored in the list of members in the cache for the given group
For each item (group name) in the list of groups retrieved in step 1:
the display name of a shared roster group is retrieved from the group cache
for each IDs of users which belong to the group, retrieved from the group cache:
the ID is skipped if it’s the same as the one for which we are retrieving the roster. This is so that the user does not have himself in the roster.
the display name of a shared roster user is retrieved:
first, unless the user name cache is fresh (see the ldap_user_cache_validity option), it is refreshed by running the User Filter, against the Base DN, retrieving the values of attributes named by ldap_useruid and ldap_userdesc.
then, the display name for the given user ID is retrieved from the user name cache.
Since there are many possible DIT layouts, it will probably be easiest to understand how to configure the module by looking at an example for a given DIT (or one resembling it).
This seems to be the kind of DIT for which this module was initially designed. Basically there are just user objects, and group membership is stored in an attribute individually for each user. For example in a layout shown in figure 3.1, the group of each user is stored in its ou attribute.
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