1 package C4::Auth_with_cas;
3 # Copyright 2009 BibLibre SARL
5 # This file is part of Koha.
7 # Koha is free software; you can redistribute it and/or modify it
8 # under the terms of the GNU General Public License as published by
9 # the Free Software Foundation; either version 3 of the License, or
10 # (at your option) any later version.
12 # Koha is distributed in the hope that it will be useful, but
13 # WITHOUT ANY WARRANTY; without even the implied warranty of
14 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 # GNU General Public License for more details.
17 # You should have received a copy of the GNU General Public License
18 # along with Koha; if not, see <http://www.gnu.org/licenses>.
25 use Koha::AuthUtils qw(get_script_name);
26 use Authen::CAS::Client;
32 use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $debug);
38 @EXPORT = qw(check_api_auth_cas checkpw_cas login_cas logout_cas login_cas_url logout_if_required);
42 my $yamlauthfile = C4::Context->config('intranetdir') . "/C4/Auth_cas_servers.yaml";
45 # If there's a configuration for multiple cas servers, then we get it
47 ($defaultcasserver, $casservers) = YAML::LoadFile($yamlauthfile);
48 $defaultcasserver = $defaultcasserver->{'default'};
50 # Else, we fall back to casServerUrl syspref
51 $defaultcasserver = 'default';
52 $casservers = { 'default' => C4::Context->preference('casServerUrl') };
59 # Is there a configuration file for multiple cas servers?
61 return (-e qq($yamlauthfile));
64 # Returns configured CAS servers' list if multiple authentication is enabled
71 my ( $query, $type ) = @_;
72 my ( $cas, $uri ) = _get_cas_and_service( $query, undef, $type );
74 # We don't want to keep triggering a logout, if we got here,
75 # the borrower is already logged out of Koha
76 $uri =~ s/\?logout\.x=1//;
78 my $logout_url = $cas->logout_url( url => $uri );
79 $logout_url =~ s/url=/service=/
80 if C4::Context->preference('casServerVersion') eq '3';
82 print $query->redirect($logout_url);
88 my ($query, $type) = @_;
89 my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
90 print $query->redirect( $cas->login_url($uri));
93 # Returns CAS login URL with callback to the requesting URL
95 my ( $query, $key, $type ) = @_;
96 my ( $cas, $uri ) = _get_cas_and_service( $query, $key, $type );
97 return $cas->login_url($uri);
100 # Checks for password correctness
101 # In our case : is there a ticket, is it valid and does it match one of our users ?
103 $debug and warn "checkpw_cas";
104 my ($dbh, $ticket, $query, $type) = @_;
106 my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
110 $debug and warn "Got ticket : $ticket";
112 # We try to validate it
113 my $val = $cas->service_validate($uri, $ticket );
116 if ( $val->is_success() ) {
118 my $userid = $val->user();
119 $debug and warn "User CAS authenticated as: $userid";
121 # we should store the CAS ticekt too, we need this for single logout https://apereo.github.io/cas/4.2.x/protocol/CAS-Protocol-Specification.html#233-single-logout
123 # Does it match one of our users ?
124 my $sth = $dbh->prepare("select cardnumber from borrowers where userid=?");
125 $sth->execute($userid);
127 $retnumber = $sth->fetchrow;
128 return ( 1, $retnumber, $userid, $ticket );
130 $sth = $dbh->prepare("select userid from borrowers where cardnumber=?");
131 $sth->execute($userid);
133 $retnumber = $sth->fetchrow;
134 return ( 1, $retnumber, $userid, $ticket );
137 # If we reach this point, then the user is a valid CAS user, but not a Koha user
138 $debug and warn "User $userid is not a valid Koha user";
141 $debug and warn "Problem when validating ticket : $ticket";
142 $debug and warn "Authen::CAS::Client::Response::Error: " . $val->error() if $val->is_error();
143 $debug and warn "Authen::CAS::Client::Response::Failure: " . $val->message() if $val->is_failure();
144 $debug and warn Data::Dumper::Dumper($@) if $val->is_error() or $val->is_failure();
152 sub check_api_auth_cas {
153 $debug and warn "check_api_auth_cas";
154 my ($dbh, $PT, $query, $type) = @_;
156 my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
158 # If we have a Proxy Ticket
160 my $r = $cas->proxy_validate( $uri, $PT );
163 if ( $r->is_success ) {
165 # We've got a username !
166 $debug and warn "User authenticated as: ", $r->user, "\n";
167 $debug and warn "Proxied through:\n";
168 $debug and warn " $_\n" for $r->proxies;
170 my $userid = $r->user;
172 # we should store the CAS ticket too, we need this for single logout https://apereo.github.io/cas/4.2.x/protocol/CAS-Protocol-Specification.html#233-single-logout
174 # Does it match one of our users ?
175 my $sth = $dbh->prepare("select cardnumber from borrowers where userid=?");
176 $sth->execute($userid);
178 $retnumber = $sth->fetchrow;
179 return ( 1, $retnumber, $userid, $PT );
181 $sth = $dbh->prepare("select userid from borrowers where cardnumber=?");
183 $sth->execute($userid);
185 $retnumber = $sth->fetchrow;
186 return ( 1, $retnumber, $userid, $PT );
189 # If we reach this point, then the user is a valid CAS user, but not a Koha user
190 $debug and warn "User $userid is not a valid Koha user";
193 $debug and warn "Proxy Ticket authentication failed";
200 # Get CAS handler and service URI
201 sub _get_cas_and_service {
203 my $key = shift; # optional
206 my $uri = _url_with_get_params($query, $type);
208 my $casparam = $defaultcasserver;
209 $casparam = $query->param('cas') if defined $query->param('cas');
210 $casparam = $key if defined $key;
211 my $cas = Authen::CAS::Client->new( $casservers->{$casparam} );
213 return ( $cas, $uri );
216 # Get the current URL with parameters contained directly into URL (GET params)
217 # This method replaces $query->url() which will give both GET and POST params
218 sub _url_with_get_params {
224 ? C4::Context->preference('OPACBaseURL')
225 : C4::Context->preference('staffClientBaseURL');
226 $uri_base_part .= get_script_name();
228 my $uri_params_part = '';
229 foreach my $param ( $query->url_param() ) {
230 # url_param() always returns parameters that were deleted by delete()
231 # This additional check ensure that parameter was not deleted.
232 my $uriPiece = $query->param($param);
234 $uri_params_part .= '&' if $uri_params_part;
235 $uri_params_part .= $param . '=';
236 $uri_params_part .= URI::Escape::uri_escape( $uriPiece );
239 $uri_base_part .= '?' if $uri_params_part;
241 return $uri_base_part . $uri_params_part;
244 =head2 logout_if_required
246 If using CAS, this subroutine will trigger single-signout of the CAS server.
250 sub logout_if_required {
252 # Check we havent been hit by a logout call
253 my $xml = $query->param('logoutRequest');
254 return 0 unless $xml;
256 my $dom = XML::LibXML->load_xml(string => $xml);
258 foreach my $node ($dom->findnodes('/samlp:LogoutRequest')){
259 # We got a cas single logout request from a cas server;
260 $ticket = $node->findvalue('./samlp:SessionIndex');
263 return 0 unless $ticket;
265 # We've been called as part of the single logout destroy the session associated with the cas ticket
266 my $params = C4::Auth::_get_session_params();
267 my $success = CGI::Session->find( $params->{dsn}, sub {delete_cas_session(@_, $ticket)}, $params->{dsn_args} );
269 print $query->header;
273 sub delete_cas_session {
276 if ($session->param('cas_ticket') && $session->param('cas_ticket') eq $ticket ) {
287 C4::Auth - Authenticates Koha users
291 use C4::Auth_with_cas;