Package =TWiki::LoginManager

The package is also a Factory for login managers and also the base class for all login managers.

On it's own, an object of this class is used when you specify 'none' in the security setup section of configure. When it is used, logins are not supported. If you want to authenticate users then you should consider TemplateLogin or ApacheLogin, which are subclasses of this class.

If you are building a new login manager, then you should write a new subclass of this class, implementing the methods marked as VIRTUAL. There are already examples in the lib/TWiki/LoginManager directory.

The class has extensive tracing, which is enabled by $TWiki::cfg{Trace}{LoginManager.pm}. The tracing is done in such a way as to let the perl optimiser optimise out the trace function as a no-op if tracing is disabled.

Here's an overview of how it works:

• • TWiki::LoginManager::ApacheLogin looks at REMOTE_USER (only for authenticated scripts)
  • TWiki::LoginManager::TemplateLogin just returns undef

ObjectData =twiki

The TWiki object this login manager is attached to.

StaticMethod *makeLoginManager ($twiki) -> $TWiki::LoginManager

Factory method, used to generate a new TWiki::LoginManager object for the given session.

ClassMethod new ($session,$impl)

Construct the user management object

ObjectMethod finish ()

ClassMethod _real_trace ($session,$impl)

Construct the user management object

ClassMethod _IP2SID ($session,$impl)

ObjectMethod loadSession ($defaultUser) -> $login

Get the client session data, using the cookie and/or the request URL. Set up appropriate session variables in the twiki object and return the login name.

$defaultUser is a username to use if one is not available from other sources. The username passed when you create a TWiki instance is passed in here.

ObjectMethod checkAccess ()

Check if the script being run in this session is authorised for execution. If not, throw an access control exception.

ObjectMethod complete ()

Complete processing after the client's HTTP request has been responded to. Flush the user's session (if any) to disk.

StaticMethod *expireDeadSessions ()

Delete sessions and passthrough files that are sitting around but are really expired. This assumes that the sessions are stored as files.

This is a static method, but requires TWiki::cfg. It is designed to be run from a session or from a cron job.

ObjectMethod userLoggedIn ($login,$wikiname)

Called when the user is known. It's invoked from TWiki::UI::Register::finish for instance,

1. when the user follows the link in their verification email message
2. or when the session store is read
3. when the user authenticates (via templatelogin / sudo)

• $login - string login name
• $wikiname - string wikiname

ObjectMethod _myScriptURLRE ($thisl)

ObjectMethod _rewriteURL ($thisl)

ObjectMethod _rewriteFORM ($thisl)

ObjectMethod *endRenderingHandler ()

This handler is called by getRenderedVersion just before the plugins postRenderingHandler. So it is passed all HTML text just before it is printed.

DEPRECATED Use postRenderingHandler instead.

ObjectMethod _pushCookie ($thisl)

ObjectMethod addCookie ($c)

Add a cookie to the list of cookies for this session.

• $c - a CGI::Cookie

ObjectMethod modifyHeader (\%header)

Modify a HTTP header

• \%header - header entries

ObjectMethod *redirectCgiQuery ($url)

Generate an HTTP redirect on STDOUT, if you can. Return 1 if you did.

• $url - target of the redirection.

ObjectMethod *getSessionValues () -> \%values

Get a name->value hash of all the defined session variables

ObjectMethod *getSessionValue ($name) -> $value

Get the value of a session variable.

ObjectMethod *setSessionValue ($name,$value)

Set the value of a session variable. We do not allow setting of AUTHUSER.

ObjectMethod *clearSessionValue ($name) -> $boolean

Clear the value of a session variable. We do not allow setting of AUTHUSER.

ObjectMethod *forceAuthentication () -> boolean

VIRTUAL METHOD implemented by subclasses

Triggered by an access control violation, this method tests to see if the current session is authenticated or not. If not, it does whatever is needed so that the user can log in, and returns 1.

If the user has an existing authenticated session, the function simply drops though and returns 0.

ObjectMethod loginUrl (...) -> $url

VIRTUAL METHOD implemented by subclasses

Return a full URL suitable for logging in.

• ... - url parameters to be added to the URL, in the format required by TWiki::getScriptUrl()

ObjectMethod getUser ()

VIRTUAL METHOD implemented by subclasses

If there is some other means of getting a username - for example, Apache has remote_user() - then return it. Otherwise, return undef and the username stored in the session will be used.

ObjectMethod _LOGIN ($thisl)

ObjectMethod _LOGOUTURL ($thisl)

ObjectMethod _LOGOUT ($thisl)

ObjectMethod _AUTHENTICATED ($thisl)

ObjectMethod _CANLOGIN ($thisl)

ObjectMethod *_SESSION_VARIABLE ($thisl)

ObjectMethod _LOGINURL ($thisl)

ObjectMethod _dispLogon ($thisl)

PrivateMethod _skinSelect ()

Internal use only TODO: what does it do?

sub createCryptToken ( $session )-> $token Takes the input as session and returns the MD5 hash string. This subroutine is responsible for updating the token database

The tokens solve the CSRF issue

This subroutine takes care of cleaning used tokens Usually called from token verification subroutines.

sub addCryptTokeninForm ( )-> returns the form with "crypttoken" html input hidden field

If TWiki Application developer has added "crypttoken" then the current subroutine returns the form without performing any parsing. If the form with method - POST do not have any "crypttoken", this subroutine adds the token.