-ikiwiki should support [Central Authentication Service](http://www.ja-sig.org/products/cas/) authentication in order to use this <acronym title='Single Sign On'>SSO</acronym> mechanism very popular in universities web services.
+[[!tag patch wishlist]]
-I have already written a first draft plugin supporting that authentication mechanism.
+ikiwiki should support [Central Authentication
+Service](http://www.ja-sig.org/products/cas/) authentication in order to use
+this <acronym title='Single Sign On'>SSO</acronym> mechanism very popular in
+universities web services.
-What is the best way to submit it to you ?
+I have already written a first draft plugin supporting that authentication
+mechanism. It works for me with my university CAS service. I did not try it
+with other CAS server but it do not see any reason why it should not work.
+
+What is the best way to submit it to you (just in case it can help my patch
+follows) ?
--[[/users/bbb]]
+
+> Inline here is ok; git-am by mail is ok; a git repo I can pull from also
+> ok.
+>
+> This looks pretty acceptable as-is, but you need to put a copyright and
+> license statement at the top. I have a few questions that I'll insert
+> inline with the patch below. --[[Joey]]
+
+------------------------------------------------------------------------------
+ diff --git a/IkiWiki/Plugin/cas.pm b/IkiWiki/Plugin/cas.pm
+ new file mode 100644
+ index 0000000..ea189df
+ --- /dev/null
+ +++ b/IkiWiki/Plugin/cas.pm
+ @@ -0,0 +1,94 @@
+ +#!/usr/bin/perl
+ +# JaSIG CAS support by Bruno Beaufils <bruno@boulgour.com>
+ +package IkiWiki::Plugin::cas;
+ +
+ +use warnings;
+ +use strict;
+ +use IkiWiki 2.00;
+ +use AuthCAS; # http://search.cpan.org/~osalaun/AuthCAS-1.3.1/
+
+> In ikiwiki we generally deman-load perl modules only when they're used.
+> This avoids loading expensive modules when the CGI isn't doing
+> authentication. Can you do that with AuthCAS? Something like this before
+> the use of it: `eval q{use AuthCAS}; error $@ if $@`
+
+ +
+ +sub import {
+ + hook(type => "getopt", id => "cas", call => \&getopt);
+ + hook(type => "auth", id => "cas", call => \&auth);
+ + hook(type => "formbuilder_setup", id => "cas", call => \&formbuilder_setup);
+ +}
+
+> Could you please use tabs for indentation of program flow?
+
+ +# FIXME: We should check_config to ensure that :
+ +# * cas_url and ca_file are present
+
+> Please fix that..
+
+ +# * no other auth plugin are present (at least passwordauth and openid)
+
+> Why would you want to make other auth plugins not work? Could a site not
+> legitimatly chose to use this and another auth method?
+
+ +sub getopt () {
+ + eval q{use Getopt::Long};
+ + error($@) if $@;
+ + Getopt::Long::Configure('pass_through');
+ + GetOptions("cas_url=s" => \$config{cas_url});
+ + GetOptions("ca_file=s" => \$config{ca_file});
+ +}
+ +
+ +sub auth ($$) {
+ + my $q=shift;
+ + my $session=shift;
+ +
+ + my $cas = new AuthCAS(casUrl => $config{'cas'}{'cas_url'},
+ + CAFile => $config{'cas'}{'ca_file'});
+ +
+ + my $service = $config{'cgiurl'};
+ + my $ticket = $q->param('ticket');
+ +
+ + unless (defined($ticket)) {
+ + $service .= "?$ENV{QUERY_STRING}";
+ + my $login_url = $cas->getServerLoginURL($service);
+ + debug("CAS: asking a Service Ticket for service $service");
+ + IkiWiki::redirect($q, $login_url);
+ + exit 0;
+ + } else {
+ + $service = $service . "?$ENV{QUERY_STRING}";
+ + $service =~ s/\&ticket=$ticket//;
+ + my $user = $cas->validateST($service, $ticket);
+ + if (defined $user) {
+ + debug("CAS: validating a Service Ticket ($ticket) for service $service");
+ + $session->param(name=>$user);
+ + $session->param(CASservice=>$service);
+ + IkiWiki::cgi_savesession($session);
+ + } else {
+ + error("CAS failure: ".&AuthCAS::get_errors());
+ + }
+ + }
+ +}
+ +
+ +# I use formbuilder_setup and not formbuilder type in order to bypass the
+ +# Logout processing done in IkiWiki::CGI::cgi_prefs()
+ +sub formbuilder_setup (@) {
+ + my %params=@_;
+ +
+ + my $form=$params{form};
+ + my $session=$params{session};
+ + my $cgi=$params{cgi};
+ + my $buttons=$params{buttons};
+ +
+ + my $cas = new AuthCAS(casUrl => $config{'cas'}{'cas_url'},
+ + CAFile => $config{'cas'}{'ca_file'});
+ +
+ + if ($form->title eq "preferences") {
+ + # Show the login
+ + if (! defined $form->field(name => "name")) {
+ + $form->field(name => "CAS ID",
+ + disabled => 1,
+ + value => $session->param("name"),
+ + size => 50,
+ + force => 1,
+ + fieldset => "login");
+ + }
+ +
+ + # Force a logout if asked
+ + if ($form->submitted && $form->submitted eq 'Logout')
+ + {
+ + debug("CAS: asking to remove the Ticket Grant Cookie");
+ + IkiWiki::redirect($cgi, $cas->getServerLogoutURL($config{'url'}));
+ + $session->delete();
+ + exit 0;
+ + }
+ + }
+ +}
+ +
+ +1
+ diff --git a/doc/plugins/cas.mdwn b/doc/plugins/cas.mdwn
+ new file mode 100644
+ index 0000000..2f2f53e
+ --- /dev/null
+ +++ b/doc/plugins/cas.mdwn
+ @@ -0,0 +1,18 @@
+ +[[ template id=plugin name=cas core=0 author="[[bbb]]"]]
+ +[[ tag type/auth]]
+ +
+ +This plugin allows users to use authentication offered by a
+ +[JaSIG](http://www.ja-sig.org) [<acronym title='Central Authentication
+ +Service'>CAS</acronym>](http://www.ja-sig.org/products/cas/) server to log
+ +into the wiki.
+ +
+ +The plugin needs the [[!cpan AuthCAS-1.3.1]] perl module.
+
+> Does it really need that specific version? I think you should lose the
+> version part.
+
+ +
+ +This plugin has two mandatory configuration option. You **must** set `--cas_url`
+ +to the url of a server offering CAS 2.0 authentication. You must also set the
+ +`--ca_file` to an absolute path to the file containing CA certificates used by
+ +the server (generally, aka under Debian, fixing that value to
+ +`/etc/ssl/certs/ca-certificates.crt` is sufficient).
+
+> It would be good to add commented-out examples of these to
+> ikiwiki.setup as well.
+
+ +This plugin is not enabled by default. It can not be used with other
+ +authentication plugin, such as [[passwordauth]] or [[openid]].
+
+------------------------------------------------------------------------------