CSRF protection for the login form. The authenticate_user_login function was
extended to validate the token (in \core\session\manager) but by default it
does not perform the extra validation. Existing uses of this function from
auth plugins and features like "change password" will continue to work without
changes. New config value $CFG->disablelogintoken can bypass this check.
get_cache_flags() is only useful when you want multiple responses or
you don't know the name/key for the value pair. We know the name/key
here is the session ID, so use get_cache_flag() instead and gain the
performance benefit.
The unit tests were failing because the upgrade step was missed.
In addition, there was a typo in a variable name, which meant that the
role was not actually synchronised.
While ldap_get_entries_moodle() PHPdocs state that it returns "array
ldap-entries with lower-cased attributes as indexes.", this is not true. It
uses ldap_get_attributes() internally, which returns both numerically indexed
attribute names, and dictionary-like entries indexed by attribute names.
Current code lowercases the dictionary-like entries, but then uses the
numerically indexed entries for the attribute names used as keys in the
returned array. The numerically indexed names might or might not be lowercased,
depending on the LDAP server and PHP version) version. E.g., OpenLDAP 2.x,
Novell eDirectory 8.x and MS Active Directory return mixed-cased attribute
names, and PHP 5.x and PHP 7.x don't lowercase them inside ldap_get_entries().
This is probably why all calls to ldap_get_entries_moodle() are followed by
calls to array_change_key_case(), even if that shouldn't be necessary.
So make sure we always return lower-cased attributs as indexes and add some
unit tests to avoid regressions in the future.
There is at least one LDAP server (Sun Directory Server) that doesn't
support Paged Results extension, even if it supports LDAP version 3. So
checking just for LDAP version is not enough.
If possible, we check the supportedControl attribute of the LDAP rootDSE
and see if the paged results control is available. This needs an LDAP
connection, which might not be possible to establish before we configure
some essential LDAP settings (server, bind user, password, etc.). Thus
we try to establish the connection and check the supportedControl
attribute. But if we fail, we perform only basic checks that are less
accurate and err on the side of cautiousness.
If there is a required custom field that the user can fill by editing
their profile, and that field is missing, the user should be considered
as not fully set up. Instead, we want to redirect them to edit their
profile first.
There are some exceptions when we want to fall back to the previous
behaviour and check just the name and email fields. These exceptional
cases include checking remote user data in incoming MNet request (no
user id, no custom fields supported) and calls to require_login() with
redirecting disabled (typically ajax filepicker requests on profile
editing page itself).
Additional plugins that call the function user_not_fully_set_up()
themselves, should perform the strict check in most/typical cases. So
the strict mode is enabled by default even if it changes the behaviour
slightly. In improbable case of additional plugins relying on the
previous behaviour of the function, they can use the $strict parameter
and keep performing the lax check. However, I am sure the correct fix in
that case will likely be to stop abusing this function.
Note that custom fields are not currently transferred during the MNet
roaming. So having custom fields configured as required on MNet service
provider site (where users can't edit their profiles) is expected to
display an error (as the site is considered as misconfigured).
dn with fine grained password should be used
to get msds-maximumpasswordage attribute.
No checks should be used to see if the array
key is set as entry should always return them.
When calling update_user_record() for auth_ldap the method
now has option to trigger event core\event\user_updated when
syncing with domain controller.
This means that the event will be triggered by sync_users()
but not by user_signup().
Functionality by default does not change with this patch.
However spaces are no longer stripped when cleaning usernames IF
$CFG->extendedusernamechars has been set.
Also included 2 trim statements where small issues were found with reading
external usernames in that were not filtered for trailing whitespaces.
List of changes:
* New OOP API using PHP namespace \core\session\.
* All handlers now update the sessions table consistently.
* Experimental DB session support in Oracle.
* Full support for session file handler (filesystem locking required).
* New option for alternative session directory.
* Official memcached session handler support.
* Workaround for memcached version with non-functional gc.
* Improved security - forced session id regeneration.
* Improved compatibility with recent PHP releases.
* Fixed borked CSS during install in debug mode.
* Switched to file based sessions in new installs.
* DB session setting disappears if DB does not support sessions.
* DB session setting disappears if session handler specified in config.php.
* Fast purging of sessions used in request only.
* No legacy distinction - file, database and memcached support the same functionality.
* Session handler name included in performance info.
* Fixed user_loggedin and user_loggedout event triggering.
* Other minor bugfixing and improvements.
* Fixed database session segfault if MUC disposed before $DB.
Limitations:
* Session access time is now updated right after session start.
* Support for $CFG->sessionlockloggedinonly was removed.
* First request does not update userid in sessions table.
* The timeouts may break badly if server hosting forces PHP.ini session settings.
* The session GC is a lot slower, we do not rely on external session timeouts.
* There cannot be any hooks triggered at the session write time.
* File and memcached handlers do not support session lock acquire timeouts.
* Some low level PHP session functions can not be used directly in Moodle code.
