LdapContrib

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This package offers basic LDAP services for TWiki and offers authentication of TWiki users by binding to an LDAP server as well as incorporate LDAP user groups into TWiki's access control. Note, however that you need at least TWiki-4.0.3 for that. Optionally, if you need an interface to query your LDAP directory and display the results in a TWiki topic install the TWiki:Plugins/LdapNgPlugin which will make use of the LdapContrib services. This work is a rewrite of the TWiki:Plugins/LdapPlugin by TWiki:Main/GerardHickey while bringing authentication, user management and other LDAP applications onto a common base.

Note: This package downloads all relevant records from your LDAP server into a local cache the first time you use it. This can take a noticeable period of time depending on the size of your LDAP database. This cache will be refreshed on a configurable interval (defaults to once a day). You can also disable automatic refreshing and refresh the LdapContrib's cache manually using the "Refresh Cache" button below. Read the documentation of the MaxCacheAge variable in the section "Performance Settings" below on how to configure the refesh intervals.

Tip: You can add this button on any page by adding

%INCLUDE{"%TWIKIWEB%.LdapContrib"}%

to it.

LDAP questionary

Before you can further configure TWiki's LDAP connection you will have to answer a set of basic questions about your LDAP server. These are:

1. What's the host name (or IP address) of the LDAP server (e.g. ldap.my.domain.com)?
2. What port does it listen to LDAP requests (e.g. 389)?
3. Does your LDAP Server use SASL to authenticate connections? If so which authentication mechanism does it use (EXTERNAL, DIGEST-MD5, ...)?
4. Do you have a kind of "proxy" user that TWiki can use to perform the initial connection? You need its DN and credentials. Advice: don't use the LDAP admin account, you only need a simple user that has read access to all of the directory (or the relevant parts); it does not need any write access.
5. What is the "base dn" of the directory (e.g. dc=my,dc=domain,dc=com )?
6. What is the common root/branch for all users? For example, Are they all found under ou=people,dc=my,dc=domain,dc=com or are they are scattered all over the place?
7. What is the common root/branch where all groups are defined (e.g. ou=group,dc=my,dc=domain,dc=com)?
8. What object class do user records have (e.g. objectClass=organizationalPerson )?
9. What object class do group records have (e.g. objectClass=group )?
10. Which attribute of a user record should be used to log in (must be unique)?
11. Which attribute(s) of a user record do you want to use to construct a WikiName (used to display them in TWiki, pointing to their homepage)?
12. What's the name attribute of a group?
13. Which attribute in a group record defines its members (e.g. member or memberUid)? Note, that if the member attribute of a group is a DN you need to enable "member indirection" (see LdapContrib).

Collect the answers to these questions either yourself using your favorit LDAP browser, or ask your friendly LDAP admin.

Authentication

To make use of authentication of TWiki users using your LDAP server you you have to register the LdapUser class as the so called PasswordManager. This is done by adding the following lines in the lib/LocalSite.cfg configuration file (or by using the configure tool alternatively):

$TWiki::cfg{PasswordManager} = 'TWiki::Users::LdapUser';

There is a further option to fallback to TWiki's normal authentication mechanism by defining a secondary password manager. This allows you to create native TWiki accounts, e.g. a TWikiAdmin account and authenticate him without LDAP. Use the following setting to fallback to a htpasswd based authentication.

$TWiki::cfg{Ldap}{SecondaryPasswordManager} = 'TWiki::Users::HtPasswdUser';

So whenever authentication against LDAP fails, this second password manager will be used.

User Groups

LDAP group records can be used in TWiki's access control by registering a UserMappingManager implementation. This is done by adding the following to your lib/LocalSite.cfg configuration file (or by using the configure tool alternatively):

$TWiki::cfg{UserMappingManager} = 'TWiki::Users::LdapUserMapping';

In addition you can decide if you want to add the LDAP groups to TWiki or use LDAP groups solely. This is controled by the TWikiGroupsBackoff flag. If switched on then LDAP groups will be added. If there's a name clash LDAP groups take precedence. If switched off TWikiGroups are ignored.

You might decide in not using your LDAP groups in TWiki but still map login names to WikiNames. Both, LDAP user groups and name mapping is done by the UserMappingManager. So to make use of name mapping but not its group feature, register the LdapUserMapping implementation for the UserMappingManager but disable the MapGroups setting.

Membership

LDAP servers follow different schemata to define "membership". They store the information either using a set of unique ids in the group object (posixGroup) or the full DNs of the user objects (groupOfNames). In the latter case the user objects' unique ids have to be fetched separately based on their distinguished name. This mode has to be switched on using the MemberIndirection setting.

Note, that the reverse relation where the user objects store in which group they participate (for example using a memberOf attribute) is maintained by some LDAP servers automatically. Those that encode membership this way only are not supported by the LdapContrib yet.

Furthermore, user objects may have a primary group attribute (posixAccount). This is a simple value (vs. multi-value) and stores the id of a default group that user is member of. This information is not used by the LdapContrib.

In short, the LdapContrib reads membership information as they are stored in the group objects only, and may map the member object indirectly to the login name.

Normalization of login, wiki and group names

LdapContrib reads three kinds of names from your LDAP server and reuses these to identify the related entities in TWiki. These are the login names - used to log in -, the WikiNames - used to display users online -, and the group names - used in access control lists.

The WikiName can be generated by setting the two parameters WikiUserNameAttribute and NormalizeWikiName. WikiUserNameAttribute can be a comma separated list of LDAP attributes that are then assembled to form the WikiName. If the NormalizeWikiName flag is set a couple of extra operations are performed to generate a proper WikiName, i.e. removing illegal characters. Given the setting

$TWiki::cfg{Ldap}{WikiNameAttribute} = 'givenName,sn';
$TWiki::cfg{Ldap}{NormalizeWikiNames} = 1;

The givenName and sn (surname) LDAP attributes will be fetched and concatenated to form a WikiName, so that "givenName=Hans-Peter,sn=Leuth�user-Schnarrenberg" will result in the WikiName "HansPeterLeuthaeuserSchnarrenberg". If one of the WikiNameAttributes is 'mail' the @mydomain.com part will be removed all together.

The login name can be normalized by enabling the

$TWiki::cfg{Ldap}{NormalizeLoginNames} = 1;

setting. However the normalized result will not be forced to be a cammel case WikiName.

Similar to the WikiName of a user, group names can be normalized using

$TWiki::cfg{Ldap}{NormalizeGroupNames} = 1;

If a user in your LDAP directory changed his name, e.g. because of a mariage, this use can be mapped to his/her old account using an alias that points back from the old WikiName to the new one. This is done using a setting like this:

$TWiki::cfg{Ldap}{WikiNameAliases} = 'MaryMalone=MaryForrester, ...'

The parameter takes a comma separated list of FromWikiName=ToWikiName. Whenever this account is still used in a TWiki access control list, its rights will be inheritted by the targeted ToWikiName account.

SSO and LdapContrib

First of all, LdapContrib does not provide any SSO solution. Nor does LDAP per se. However, LDAP directories might come with SSO facilities that they provide via kerberos or similar. Unfortunately, nowaday browsers themselves are not kerberized. They depend on talking to the webserver using HTTP means, which then decides which tickets are valid for the remote user by talking to the acutal authority. That is, authentication is implemented using an approriate apache module.

LdapContrib can then be used to complete an LDAP integration of TWiki by providing the mapping to WikiNames as well as email information and group definitions drawn from the LDAP directory directly.

The remaining problem is that, when a new user has been added to your LDAP directory recently, and he/she then dashes off to sign on to TWiki right away, LdapContrib's cache most probably is outdated. This situation is different from one where users were authenticated by TWiki's own TemplateLogin mechanism. The user would then not be able to login until the cache has been refreshed manually or automatically.

So when the new user is authenticated using SSO and then hits TWiki, it might fail to compute the proper WikiName. The solution to this problem is to use the LdapApacheLogin login manager as a drop in replacement to the standard ApacheLogin that would have been used in this situation. The LdapApacheLogin will then take care that the remote user is known to the cache and add this single record if it is missing.

Bottomline: whenever you are using apache to authenticate to TWiki, do use the LdapApacheLogin manager. Or in other words, whenever you configured TWiki to use the standard ApacheLogin manager, and you now install LdapContrib, change it to LdapApacheLogin to assure LdapContrib's cache is up to date.

Simple Example

For the sake of this documentation we assume that users accounts in your database are at leat of the type posixAccount and optionally also of type inetOrgPerson storing email addresses. Moreover users are stored in a subtree ou=people and groups are defined in ou=group. Here are some example LDAP records:

dn: uid=testuser1,ou=people,dc=my,dc=domain,dc=com
objectClass: inetOrgPerson
objectClass: posixAccount
cn: Test User1
uid: testuser1
uidNumber: 1024
gidNumber: 100
homeDirectory: /home/testuser1
loginShell: /bin/bash
mail: testuser1@my.domain.com

dn: uid=testuser2,ou=people,dc=my,dc=domain,dc=com
objectClass: inetOrgPerson
objectClass: posixAccount
cn: Test User2
uid: testuser2
uidNumber: 1024
gidNumber: 100
homeDirectory: /home/testuser2
loginShell: /bin/bash
mail: testuser2@my.domain.com
mail: testuser2@gmx.com

# users, Group, nats.informatik.uni-hamburg.de
dn: cn=users,ou=group,dc=my,dc=domain,dc=com
objectClass: posixGroup
cn: users
gidNumber: 100
memberUid: testuser1
memberUid: testuser2

Please have a look at your LDAP manual on how to set up an LDAP server and populate it with user account records. Have a look at the Quick-Start Guide on how to install OpenLdap.

Use the following settings for the above example:

$TWiki::cfg{Ldap}{Host} = 'ldap.my.domain.com';
$TWiki::cfg{Ldap}{Port} = 389; 
$TWiki::cfg{Ldap}{UserBase} = 'ou=people,dc=my,dc=domain,dc=com'; 
$TWiki::cfg{Ldap}{LoginFilter} = 'objectClass=posixAccount';
$TWiki::cfg{Ldap}{LoginAttribute} = 'uid';
$TWiki::cfg{Ldap}{WikiNameAttribute} = 'cn';
$TWiki::cfg{Ldap}{NormalizeWikiNames} = 1; 
$TWiki::cfg{Ldap}{GroupBase} = 'ou=group,dc=my,dc=domain,dc=com';
$TWiki::cfg{Ldap}{GroupFilter} = 'objectClass=posixGroup';
$TWiki::cfg{Ldap}{GroupAttribute} = 'cn';
$TWiki::cfg{Ldap}{MemberAttribute} = 'memberUid';
$TWiki::cfg{Ldap}{MemberIndirection} = 0;
$TWiki::cfg{Ldap}{MapGroups} = 1;

Configuration

The LdapContrib package is configured using a set of variables that need to be added to the lib/LocalSite.cfg configuration file. Use the configure tool (at least once) after you installed this package. Have a lookg at your lib/LocalSite.cfg file afterwards. You might also make your changes therein directly to accomodate your TWiki installation to your specifc LDAP installation and user accounting.

Connection settings

IP address (or hostname) of the LDAP server:

$TWiki::cfg{Ldap}{Host} = 'ldap.my.domain.com';

Port used when binding to the LDAP server:

$TWiki::cfg{Ldap}{Port} = 389; 

LDAP protocol version to use when querying the server; Possible values are: 2, 3

$TWiki::cfg{Ldap}{Version} = '3'; 

Base DN to use in searches:

$TWiki::cfg{Ldap}{Base} = 'dc=my,dc=domain,dc=com'; 

The DN to use when binding to the LDAP server; if undefined anonymous binding will be used. Example 'cn=proxyuser,dc=my,dc=domain,dc=com'

$TWiki::cfg{Ldap}{BindDN} = 'cn=proxyuser,dc=my,dc=domain,dc=com'; 

The password used when binding to the LDAP server using the BindDN account:

$TWiki::cfg{Ldap}{BindPassword} = 'secret'; 

Use SASL authentication when binding to the server; Note, when using SASL the BindDN and BindPassword setting are used to configure the SASL access.

$TWiki::cfg{Ldap}{UseSASL} = 0; 

List of SASL authentication mechanism to try (defaults to 'PLAIN CRAM-MD5 EXTERNAL ANONYMOUS'):

$TWiki::cfg{Ldap}{SASLMechanism} = 'PLAIN CRAM-MD5 EXTERNAL ANONYMOUS';

User settings

The options below configure how TWiki will extract account records from LDAP.

Define the DN of the users tree (defaults to $TWiki::cfg{Ldap}{Base}):

$TWiki::cfg{Ldap}{UserBase} = 'ou=people,dc=my,dc=domain,dc=com'; 

Filter to be used to find login accounts:

$TWiki::cfg{Ldap}{LoginFilter} = 'objectClass=posixAccount'; 

Define the user login name attribute (must contain a unique value for each user):

$TWiki::cfg{Ldap}{LoginAttribute} = 'uid'; 

Define the WikiUserName attribute(s):

$TWiki::cfg{Ldap}{WikiNameAttribute} = 'cn'; 

Enable/disable normalization of WikiUserNames as they come from LDAP:

$TWiki::cfg{Ldap}{NormalizeWikiNames} = 1; 

Enable/disable normalization of login names as they come from LDAP:

$TWiki::cfg{Ldap}{NormalizeLoginNames} = 1; 

Alias old WikiNames to new account. This is a comma separated list of "OldName=NewName" values.

$TWiki::cfg{Ldap}{WikiNameAliases} = '';

Allow/disallow changing the LDAP password using TWiki's ChangePassword feature

$TWiki::cfg{Ldap}{AllowChangePassword} = 0; 

Define a secondary password manager used to authenticate users that are registered to TWiki natively. Note, that this must not be TWiki::Users::LdapUser again!

$TWiki::cfg{Ldap}{SecondaryPasswordManager} = 'none';

Group settings

The settings below configures the mapping and processing of login names and WikiNames as well as the use of LDAP groups in TWiki.

Define the DN of the groups tree (defaults to $TWiki::cfg{Ldap}{Base})

$TWiki::cfg{Ldap}{GroupBase} = 'ou=group,dc=my,dc=domain,dc=com'; 

Filter to be used to find groups:

$TWiki::cfg{Ldap}{GroupFilter} = 'objectClass=posixGroup'; 

Define the group name:

$TWiki::cfg{Ldap}{GroupAttribute} = 'cn'; 

Define the attribute of a group that defines its members:

$TWiki::cfg{Ldap}{MemberAttribute} = 'memberUid'; 

Flag to indicate wether the member attribute of a group stores a DN:

$TWiki::cfg{Ldap}{MemberIndirection} = 1; 

Enable/disable reusage of groups defined in TWiki natively:

$TWiki::cfg{Ldap}{TWikiGroupsBackoff} = 1; 

Enable/disable normalization of group names as they come from LDAP:

$TWiki::cfg{Ldap}{NormalizeGroupNames} = 1; 

Enable/disable mapping LDAP groups; you might decide to set this to 0 and still use the LdapUserMapping implementation to construct proper WikiNames from login names with its help.

$TWiki::cfg{Ldap}{MapGroups} = 1; 

Performance settings

Maximum time a cache is kept; default is 86400 seconds;

$TWiki::cfg{Ldap}{MaxCacheAge} = 86400; 

Maximum size of the result set that the server can return; set it to 0 for unrestricted results:

$TWiki::cfg{Ldap}{PageSize} = 500; 

Prevent certain names from being looked up in LDAP:

$TWiki::cfg{Ldap}{Exclude} = 'TWikiGuest, TWikiContributor, TWikiRegistrationAgent, TWikiAdminGroup, NobodyGroup'; 

Updating the LDAP cache using a cronjob

In some environments, updating the internal LDAP cache of the LdapContrib might take considerable time. The intervals the cache data is thought to be "expired" is configured using the MaxCacheAge setting. This setting defaults to updating the cache every 24 hours. The refresh procedure will then be triggered by the first request that hits TWiki when this period expired.

To remove this burden from the "first visitor in the morning", the automatic refresh procedure can be disabled by setting

$TWiki::cfg{Ldap}{MaxCacheAge} = 0; 

This means that the age of the cached data will not be checked automatically anymore. The responsibility that the data is updated is now up to you, that is you have to update the cache explicitly. This can be done by either hitting the red "Refresh Cache" button above, or by setting up an appropriate cronjob on the machine running your TWiki server.

To trigger an explicit update of the cache on 5 past midnight every day use a cronjob similar to:

5 0 * * * cd <twiki-install-path>/bin && ./view refreshldap=on Main/WebHome >/dev/null

This will call TWiki on the commandline and provide the necessary query parameters so that the LdapContrib will force an update of the cache data.

Implementation documentation

TWiki::Contrib::LdapContrib

General LDAP services for TWiki. This class encapsulates the TWiki-specific means to integrate an LDAP directory service. Used by TWiki::Users::LdapUser for authentication, TWiki::Users::LdapUserMapping for group definitions and TWiki::Plugins::LdapNgPlugin to interface general query services.

Typical usage:

my $ldap = new TWiki::Contrib::LdapContrib;

my $result = $ldap->search(filter=>'mail=*@gmx*');
my $errorMsg = $ldap->getError();

my $count = $result->count();

my @entries = $result->sorted('sn');
my $entry = $result->entry(0);

my $value = $entry->get_value('cn');
my @emails = $entry->get_value('mail');

writeDebug($msg, $level)

Method to write a debug messages. The $msg is only written if the given current debug level is high enough ($level <= $TWiki::cfg{Ldap}{Debug}). The higher the debug level, the more verbose the debug output.

Debug output is written to STDERR.

writeWarning($msg, $level)

Method to write a warning messages. Works also if TWiki::Plugins::SESSION isn't initialized yet.

new($session, host=>'...', base=>'...', ...) -> $ldap

Construct a new TWiki::Contrib::LdapContrib object

Possible options are:

• host: ip address (or hostname)
• base: the base DN to use in searches
• port: port address used when binding to the LDAP server
• version: protocol version
• userBase: sub-tree DN of user accounts
• groupBase: sub-tree DN of group definitions
• loginAttribute: user login name attribute
• loginFilter: filter to be used to find login accounts
• groupAttribute: the group name attribute
• groupFilter: filter to be used to find groups
• memberAttribute: the attribute that should be used to collect group members
• bindDN: the dn to use when binding to the LDAP server
• bindPassword: the password used when binding to the LDAP server

Options not passed to the constructor are taken from the global settings in lib/LocalSite.cfg.

getLdapContrib($session) -> $ldap

Returns a standard singleton TWiki::Contrib::LdapContrib object based on the site-wide configuration.

connect($login, $passwd) -> $boolean

Connect to LDAP server. If a $login name and a $passwd is given then a bind is done. Otherwise the communication is anonymous. You don't have to connect() explicitely by calling this method. The methods below will do that automatically when needed.

disconnect()

Unbind the LDAP object from the server. This method can be used to force a reconnect and possibly rebind as a different user.

finish

finalize this ldap object.

checkError($msg) -> $errorCode

Private method to check a Net::LDAP::Message object for an error, sets $ldap->{error} and returns the ldap error code. This method is called internally whenever a message object is returned by the server. Use $ldap->getError() to return the actual error message.

getError() -> $errorMsg

Returns the error message of the last LDAP action or undef it no error occured.

getAccount($login) -> Net::LDAP::Entry object

Fetches an account entry from the database and returns a Net::LDAP::Entry object on success and undef otherwise. Note, the login name is match against the attribute defined in $ldap->{loginAttribute}. Account records are search using $ldap->{loginFilter} in the subtree defined by $ldap->{userBase}.

search($filter, %args) -> $msg

Returns an Net::LDAP::Search object for the given query on success and undef otherwise. If $args{base} is not defined $ldap->{base} is used. If $args{scope} is not defined 'sub' is used (searching down the subtree under $args{base}. If no $args{limit} is set all matching records are returned. The $attrs is a reference to an array of all those attributes that matching entries should contain. If no $args{attrs} is defined all attributes are returned.

If undef is returned as an error occured use $ldap->getError() to get the cleartext message of this search() operation.

Typical usage:

my $result = $ldap->search(filter=>'uid=TestUser');

cacheBlob($entry, $attribute, $refresh) -> $pubUrlPath

Takes an Net::LDAP::Entry and an $attribute name, and stores its value into a file. Returns the pubUrlPath to it. This can be used to store binary large objects like images (jpegPhotos) into the filesystem accessible to the httpd which can serve it in return to the client browser.

Filenames containing the blobs are named using a hash value that is generated using its DN and the actual attribute name whose value is extracted from the database. If the blob already exists in the cache it is not extracted once again except the $refresh parameter is defined.

Typical usage:

my $blobUrlPath = $ldap->cacheBlob($entry, $attr);

initCache()

loads/connects to the LDAP cache

refreshCache() -> $boolean

download all relevant records from the LDAP server and store it into a database

refreshUsersCache($data) -> $boolean

download all user records from the LDAP server and cache it into the given hash reference

returns true if new records have been loaded

refreshGroups($data) -> $boolean

download all group records from the LDAP server

returns true if new records have been loaded

cacheUserFromEntry($entry, $data, $wikiNames, $loginNames) -> $boolean

store a user LDAP::Entry to our internal cache

returns true if new records have been created

cacheGroupFromEntry($entry, $data, $groupNames) -> $boolean

store a group LDAP::Entry to our internal cache

returns true if new records have been created

normalizeWikiName($name) -> $string

normalizes a string to form a proper WikiName

normalizeLoginName($name) -> $string

normalizes a string to form a proper login

getGroupNames() -> @array

Returns a list of known group names.

isGroup($wikiName) -> $boolean

check if a given user is an ldap group actually

getEmails($login) -> @emails

fetch emails from LDAP

getGroupMembers($groupName) -> \@array

getWikiNameOfLogin($loginName) -> $wikiName

returns the wikiName of a loginName or undef if it does not exist

getLoginOfWikiName($wikiName) -> $loginName

returns the loginNAme of a wikiName or undef if it does not exist

getAllWikiNames() -> \@array

returns a list of all known wikiNames

getAllLoginNames() -> \@array

returns a list of all known loginNames

getDnOfLogin($loginName) -> $dn

returns the Distinguished Name of the LDAP record of the given name

changePassword($loginName, $newPassword, $oldPassword) -> $boolean

checkCacheForLoginName($loginName) -> $boolean

grant that the current loginName is cached. If not, it will download the LDAP record for this specific user and update the LDAP cache with this single record.

This happens when the user is authenticated externally, e.g. using apache's mod_authz_ldap or some other SSO, and TWiki's internal cache is not yet updated. It is completely updated regularly on a specific time interval (default every 24h). See the LdapContrib settings.

TWiki::Users::LdapUserMapping

This class allows to use user names and groups stored in an LDAP database inside TWiki in a transparent way. This replaces TWiki's native way to represent users and groups using topics with according LDAP records.

new($session) -> $ldapUserMapping

create a new TWiki::Users::LdapUserMapping object and constructs an LdapContrib object to delegate LDAP services to.

finish()

Complete processing after the client's HTTP request has been responded to. I.e. it disconnects the LDAP database connection.

getListOfGroups( ) -> @listOfUserObjects

Get a list of groups defined in the LDAP database. If twikiGroupsBackoff is defined the set of LDAP and native groups will merged whereas LDAP groups have precedence in case of a name clash.

groupMembers($group) -> @listOfTWikiUsers

Returns a list of all members of a given group. Members are TWiki::User objects.

addUserToMapping($user, $me)

overrides and thus disables the SUPER method

lookupLoginName($loginName) -> $wikiName

Map a loginName to the corresponding wikiName. This is used for lookups during user resolution, and should be as fast as possible.

lookupWikiName($wikiName) -> $loginName

Map a wikiName to the corresponding loginName. This is used for lookups during user resolution, and should be as fast as possible.

getListOfAllWikiNames() -> @wikiNames

This function gets called by the %GROUPS% and the %USERINFO{userdebug="1"}% tags.

isGroup($user) -> $boolean

Establish if a user object refers to a user group or not. This returns true for the SuperAdminGroup or the known LDAP groups. Finally, if twikiGroupsBackoff is set the native mechanism are used to check if $user is a group

getCanonicalUserID ($login) -> cUID

Convert a login name to the corresponding canonical user name.

Caution: we don't distinguish cUIDs and login names.

getLoginName ($user) -> login

Converts an internal cUID to that user's login.

Caution: we don't distinguish cUIDs and login names.

getWikiName ($cUID) -> wikiname

Maps a canonical user name to a wikiname

userExists($cUID) -> $boolean

Determines if the user already exists or not.

eachUser () -> listIterator of cUIDs

returns a list iterator for all known users

eachGroup () -> listIterator of groupnames

returns a list iterator for all known groups

eachGroupMember ($groupName) -> listIterator of cUIDs

returns a list iterator for all groups members

eachMembership ($cUID) -> listIterator of groups this user is in

returns a list iterator for all groups a user is in.

TWiki::Users::LdapUser

Password manager that uses Net::LDAP to manage users and passwords.

Subclass of TWiki::Users::Password.

This class does not grant any write access to the ldap server for security reasons. So you need to use your ldap tools to create user accounts.

Configuration: add the following variables to your LocalSite.cfg

• $TWiki::cfg{Ldap}{server} = <ldap-server uri>, defaults to localhost
• $TWiki::cfg{Ldap}{base} = <base dn> subtree that holds the user accounts e.g. ou=people,dc=your,dc=domain,dc=com

new($session) -> $ldapUser

Takes a session object, creates an LdapContrib object used to delegate LDAP calls and returns a new TWiki::User::LdapUser object

error() -> $errorMsg

return the last error during LDAP operations

fetchPass($login) -> $passwd

SMELL: this method is used most of the time to detect if a given login user is known to the database. the concrete (encrypted) password is of no interest: so better would be to implement an interface like existsUser() or the like

checkPassword($login, $password) -> $boolean

check passwd by binding to the ldap server

isManagingEmails() -> $boolean

we aare managing emails, but don't allow setting emails. alas the core does not distinguish this case, e.g. by using readOnly()

getEmails($login) -> @emails

emails might be stored in the ldap account as well if the record is of type possixAccount and inetOrgPerson. if this is not the case we fallback to twiki's default behavior

finish()

Complete processing after the client's HTTP request has been responded. i.e. destroy the ldap object.

deleteUser( $user ) -> $boolean

LDAP users can't be deleted by TWiki. So this will call the deleteUser interface of the secondary password manager only

Returns 1 on success, undef on failure.

passwd( $user, $newPassword, $newPassword ) -> $boolean

This method can only change the LDAP password. It can not add the user to the LDAP directory. To change the password the old password must always be correct. There's no mode to force the change irrespective of the existing password.

In any other case the secondary password manager gets the job.

encrypt( $user, $passwordU, $fresh ) -> $passwordE

LDAP can't encrypt passwords. But maybe the secondary password manager can.

setPassword( $login, $newPassU, $oldPassU ) -> $boolean

If the $oldPassU matches matches the user's password, then it will replace it with $newPassU.

If $oldPassU is not correct and not 1, will return 0.

If $oldPassU is 1, will force the change irrespective of the existing password, adding the user if necessary.

Otherwise returns 1 on success, undef on failure.

setEmails($user, @emails)

Set the email address(es) for the given username. TWiki can't set the email stored in LDAP. But may be the secondary password manager can.

findUserByEmail( $email ) -> \@users

• $email - email address to look up

Return a list of user objects for the users that have this email registered with the password manager. This will concatenate the result list of the LDAP manager with the secondary password manager

Installation Instructions

• Download the ZIP file from the Plugin web (see below)
• Unzip LdapContrib.zip in your TWiki installation directory. Content:

  File:	Description:
  data/TWiki/LdapContrib.txt
  lib/TWiki/Client/LdapApacheLogin.pm
  lib/TWiki/Contrib/LdapContrib/Config.spec
  lib/TWiki/Contrib/LdapContrib.pm
  lib/TWiki/LoginManager/LdapApacheLogin.pm
  lib/TWiki/Users/LdapUserMapping.pm
  lib/TWiki/Users/LdapUser.pm
  pub/TWiki/LdapContrib/TWikiDotPm-4.1.2.patch
  pub/TWiki/LdapContrib/wikiringlogo40x40.png

• Optionally, run LdapContrib_installer to automatically check and install other TWiki modules that this module depends on. You can also do this step manually.
• Alternatively, manually make sure the dependencies listed in the table below are resolved.

  Name	Version	Description
  Authen::SASL	>=2.00	Optional
  DB_File	>=1.00	Required
  Digest::MD5	>=2.36	Required
  Net::LDAP	>=0.33	Required
  IO::Socket::SSL	>=1.0	Optional
  Unicode::MapUTF8	>=1.11	Required

• Read the the above documentation, i.e. the Configuration section.
• Use configure to set the LDAP settings.
• There's a patch for TWiki-4.1.2 that backports the fixes to the %GROUPS% tag to suppress "new topic links" in the produced table. Apply it using

  cd <twiki-root>/lib; patch < ../pub/TWiki/LdapContrib/TWikiDotPm-4.1.2.patch

Contrib Info

Author:	TWiki:Main/MichaelDaum
Copyright ©:	2006-2007 Michael Daum http://michaeldaumconsulting.com This work was partly funded by Spanlink Communications and Trivadis
License:	GPL (GNU General Public License)
Version:	v2.99.5
Change History:
25 May 2008:	added alias feature, fixed normalization error, fixed cache update issue added login manager for 4.2
05 May 2008:	implemented WikiNamesAliases
14 Feb 2008:	allow to disable cache aging setting MaxCacheAge to zero
01 Feb 2008:	distinguish groups clashing with user names by appending a suffix
30 Jan 2008:	first beta towards TWiki-4.2
07 Jan 2008:	fixed initializing the cache
21 Dec 2007:	added LdapApacheLogin, made updating the cache quasi atomic
22 Nov 2007:	fixed recognition of TWikiGroups in a mixed setting
05 Oct 2007:	enabled native user registration using the secondary password manager; added support to change a user's LDAP password from within TWiki; added patch for TWiki.pm that backports some of the fixes from TWiki-4.2 to TWiki-4.1.2
05 Sep 2007:	added SASL support, added normalization of login and group names, added secondary password manager
31 Aug 2007:	rewrite of the cache
08 June 2007:	don't use the store object during TWiki's destructore; don't lookup login names of groups
04 June 2007:	don't be casesensitive for login names; fixed several utf8 issues; fixed crash when no groups where found; caching mapping privately; added MaxCacheAge; added support for nested LDAP groups
30 Apr 2007:	fixed return value on illegal lookup calls
24 Apr 2007:	be robust against the lookup-API being called with the wrong parameters; added Debug flag; fixed/improved group loading; deprecating BasePasswd in favor of UserBase; deprecating BaseGroup in favor of GroupBase
04 Apr 2007:	fixed group mapping on >4.1.2; renamed BasePasswd config parameter to UserBase; renamed BaseGroup config parameter to GroupBase; working around broken configure in 4.1.x
12 Jan 2007:	enhanced normalization of WikiNames so that they are proper WikiWords; WikiNames can be constructed from a list of LDAP attributes now
18 Dec 2006:	various performance improvements; fixed usage of limit argument; renamed configuration option "WikiNameRemoveWhiteSpace" to "NormalizeWikiName"; support for large databases using paged LDAP search results; new configuration option "Exclude" to exclude standard TWiki user accounts, e.g. TWikiRegistrationAgent, from being looked up in LDAP; added support for faster API implementing isMemberOf; added Config.spec file to integrate the LadpContrib into Twiki's "configure" tool; added support for WikiNames derived from mail attributes
03 Nov 2006:	fixed binding to the server by first searching the full dn instead of assuming a fixed one (issue found by Cederic Weber); added new feature MapGroup to be able to switch off group mapping and have ; login-to-wikiname conversion only
02 Aug 2006:	added a user accounts in memory cache
19 July 2006:	public release
24 May 2006:	api adjustments, improved wikiname generation
28 Apr 2006:	Initial version
Home:	TWiki:Plugins/LdapContrib
Feedback:	TWiki:Plugins/LdapContribDev
Appraisal:	TWiki:Plugins/LdapContribAppraisal

-- TWiki:Main/MichaelDaum - 25 May 2008