295 lines
9.4 KiB
Perl
295 lines
9.4 KiB
Perl
package Lemonldap::NG::Portal;
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print STDERR
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"See Lemonldap::NG::Portal(3) to know which Lemonldap::NG::Portal::* module to use.";
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our $VERSION = "0.52";
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1;
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__END__
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=pod
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=head1 NAME
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Lemonldap::NG::Portal - The authentication portal part of Lemonldap::NG Web-SSO
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system.
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=head1 SYNOPSIS
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use Lemonldap::NG::Portal::SharedConf;
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my $portal = new Lemonldap::NG::Portal::SharedConf (
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configStorage => {
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type => 'DBI',
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dbiChain => "dbi:mysql:database=lmSessions;host=1.2.3.4",
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dbiUser => "lemon",
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dbiPassword => "pass",
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},
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);
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if($portal->process()) {
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# Write here the menu with CGI methods. This page is displayed ONLY IF
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# the user was not redirected here by a Lemonldap::NG::Handler,
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# else, the process sub redirect the user to the initial requested URI.
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print $portal->header; # DON'T FORGET THIS (see L<CGI(3)>)
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print "...";
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# or redirect the user to the menu
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print $portal->redirect( -uri => 'https://portal/menu');
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}
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else {
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# Write here the html form used to authenticate with CGI methods.
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# $portal->error returns the error message if authentification failed
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# Warning: by defaut, input names are "user" and "password"
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print $portal->header; # DON'T FORGET THIS (see L<CGI(3)>)
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print "<html> ...";
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print '<form method="POST">';
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# In your form, the following value is required for redirection
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print '<input type="hidden" name="url" value="'.$portal->param('url').'">';
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# Next, login and password
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print 'Login : <input name="user"><br>';
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print 'Password : <input name="password" type="password" autocomplete="off"><br>';
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print '<input type=submit value="OK">';
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print '</form>';
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}
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=head1 DESCRIPTION
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Lemonldap::NG is a modular Web-SSO based on Apache::Session modules. It
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simplifies the build of a protected area with a few changes in the application.
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It manages both authentication and authorization and provides headers for
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accounting. So you can have a full AAA protection for your web space as
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described below.
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The portal part inherits from L<CGI> so yo can use it both with Apache 1 and 2
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and use all L<CGI> features.
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=head2 Authentication, Autorization, Accounting
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=head3 B<Authentication>
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If a user isn't authenticated and attemps to connect to an area protected by a
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Lemonldap::NG compatible handler, he is redirected to a portal. The portal
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authenticates user with a ldap bind by default, but you can also use another
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authentication sheme like using x509 user certificates (see
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L<Lemonldap::NG::Portal::AuthSSL> for more).
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Lemonldap use session cookies generated by L<Apache::Session> so as secure as a
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128-bit random cookie. You may use the C<securedCookie> options of
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L<Lemonldap::NG::Portal> to avoid session hijacking.
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You have to manage life of sessions by yourself since Lemonldap knows nothing
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about the L<Apache::Session> module you've choosed, but it's very easy using a
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simple cron script because L<Lemonldap::NG::Portal> stores the start time in the
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C<_utime> field.
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By default, a session stay 10 minutes in the Handler local storage, so in the
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worth case, a user is authorized 10 minutes after he lost his rights.
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=head3 B<Authorization>
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Authorization is controled only by handlers because the portal knows nothing
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about the way the user will choose. When configuring your Web-SSO, you have to:
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=over
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=item * choose the ldap attributes you want to use to manage accounting and
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authorization (see C<exportedHeaders> parameter in L<Lemonldap::NG::Portal>
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documentation),
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=item * create Perl expression to define user groups (using ldap attributes):
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optionnal, this mechanism is available with Lemonldap::NG::*::SharedConf
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modules,
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=item * create an array foreach virtual host associating URI regular
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expressions and Perl expressions to use to grant access.
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=back
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=head4 Example
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Exported variables (in Lemonldap::NG::Portal, will be stored in
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configuration database):
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exportedVars => {
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cn => "cn",
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departmentUID => "departmentUID",
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login => "uid",
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},
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User groups (stored in configuration database with L<Lemonldap::NG::Manager>):
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groups => {
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group1 => '{ $departmentUID eq "unit1" or $login = "xavier.guimard" }',
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...
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},
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Area protection (stored in configuration database with
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L<Lemonldap::NG::Manager>):
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locationRules => {
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www1.domain.com => {
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'^/protected/.*$' => '$groups =~ /\bgroup1\b/',
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default => 'accept',
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},
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www2.domain.com => {
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'^/site/.*$' => '$uid eq "xavier.guimard" or $groups =~ /\bgroup2\b/',
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'^/(js|css)' => 'accept',
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default => 'deny',
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},
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},
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=head4 Performance
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You can use Perl expressions as complicated as you want and you can use all
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the exported LDAP attributes (and create your own attributes: see examples in
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L<Lemonldap::NG::Portal> distribution) both in groups evaluations and area
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protections (you just have to call them with a "$").
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You have to be careful when choosing your expressions:
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=over
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=item * C<groups> are evaluated each time a user is redirected to the portal,
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=item * C<locationRules> are evaluated for each request.
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=back
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It is also recommanded to use the C<groups> mechanism to avoid having to
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evaluate a long expression at each HTTP request:
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locationRules => {
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www1.domain.com => {
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'^/protected/.*$' => '$groups =~ /\bgroup1\b/',
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},
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},
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You can also use ldap filters in C<groups> parameter, or Perl expression or
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mixed expressions. Perl expressions has to be enclosed with C<{}>:
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=over
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=item * C<group1 =E<gt> '(|(uid=xavier.guimard)(ou=unit1))'>
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=item * C<group1 =E<gt> '{$uid eq "xavier.guimard" or $ou eq "unit1"}'>
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=item * C<group1 =E<gt> '(|(uid=xavier.guimard){$ou eq "unit1"})'>
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=back
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It is also recommanded to use Perl expressions to avoid requiering the LDAP
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server more than 2 times per authentication.
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=head3 B<Accounting>
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=head4 I<Logging portal access>
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L<Lemonldap::NG::Portal> doesn't log anything by default, but it's easy to overload
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C<log> method for normal portal access or using C<error> method to know what
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was wrong if C<process> method has failed.
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=head4 I<Logging application access>
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Because an handler knows nothing about the protected application, it can't do
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more than logging URL. As Apache does this fine, L<Lemonldap::NG::Handler> gives it
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the name to used in logs. The C<whatToTrace> parameters indicates which
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variable Apache has to use (C<$uid> by default).
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The real accounting has to be done by the application itself which knows the
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result of SQL transaction for example.
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Lemonldap can export http headers either using a proxy or protecting directly
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the application. By default, the C<User-Auth> field is used but you can change
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it using the C<exportedHeaders> parameters (stored in the configuration
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database). This parameters contains an associative array:
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=over
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=item * B<keys> are the names of the choosen headers
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=item * B<values> are perl expressions where you can use user datas stored in
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the global store by calling them C<$E<lt>varnameE<gt>>.
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=back
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Example:
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exportedHeaders => {
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www1.domain.com => {
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'Auth-User' => '$uid',
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'Unit' => '$ou',
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},
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www2.domain.com => {
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'Authorization' => '"Basic ".encode_base64($employeeNumber.":dummy")',
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},
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}
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=head2 Storage systems
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Lemonldap::NG use 3 levels of cache for authenticated users:
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=over
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=item * an Apache::Session::* module choosed with the C<globalStorage>
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parameter (completed with C<globalglobalStorageOptions>) and used by
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L<lemonldap::NG::Portal> to store authenticated user parameters,
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=item * a L<Cache::Cache> module choosed with the C<localStorage> parameter
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(completed with C<localStorageOptions> and used to share authenticated users
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between Apache's threads or processus and of course between virtual hosts,
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=item * Lemonldap::NG variables: if the same user use the same thread or
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processus a second time, no request are needed to grant or refuse access. This
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is very efficient with HTTP/1.1 Keep-Alive system.
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=back
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So the number of request to the central storage is limited to 1 per user each
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10 minutes.
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Lemonldap::NG is very fast, but you can increase performance using a
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L<Cache::Cache> module that does not use disk access.
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=head1 USING LEMONLDAP::NG::PORTAL FOR DEVELOPMENT
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Lemonldap::NG::Portal provides different modules:
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=over
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=item * L<Lemonldap::NG::Portal::Simple>: base module to build a portal,
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=item * L<Lemonldap::NG::Portal::AuthSsl>: module that modify authentication
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scheme to use X509 authentication,
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=item * L<Lemonldap::NG::Portal::SharedConf>: this module provide the ability
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to read portal configuration from a central database. It inherits from
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L<Lemonldap::NG::Portal::Simple>. It's the more used module.
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=back
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=head1 SEE ALSO
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L<Lemonldap::NG::Portal::SharedConf>,
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L<Lemonldap::NG::Handler>, L<Lemonldap::NG::Manager>
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=head1 AUTHOR
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Xavier Guimard, E<lt>x.guimard@free.frE<gt>
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=head1 COPYRIGHT AND LICENSE
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Copyright (C) 2005 by Xavier Guimard E<lt>x.guimard@free.frE<gt>
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This library is free software; you can redistribute it and/or modify
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it under the same terms as Perl itself, either Perl version 5.8.4 or,
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at your option, any later version of Perl 5 you may have available.
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Lemonldap was originaly written by Eric German who decided to publish him in
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2003 under the terms of the GNU General Public License version 2.
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Lemonldap::NG is a complete rewrite of Lemonldap and is able to have different
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policies in a same Apache virtual host.
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=cut
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