C4/Auth_with_cas.pm

   1 package C4::Auth_with_cas;
   2
   3 # Copyright 2009 BibLibre SARL
   4 #
   5 # This file is part of Koha.
   6 #
   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.
  11 #
  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.
  16 #
  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>.
  19
  20 use strict;
  21 use warnings;
  22
  23 use C4::Debug;
  24 use C4::Context;
  25 use Koha::AuthUtils qw(get_script_name);
  26 use Authen::CAS::Client;
  27 use CGI qw ( -utf8 );
  28 use FindBin;
  29 use YAML;
  30
  31
  32 use vars qw(@ISA @EXPORT @EXPORT_OK %EXPORT_TAGS $debug);
  33
  34 BEGIN {
  35         require Exporter;
  36         $debug = $ENV{DEBUG};
  37         @ISA    = qw(Exporter);
  38         @EXPORT = qw(check_api_auth_cas checkpw_cas login_cas logout_cas login_cas_url);
  39 }
  40 my $defaultcasserver;
  41 my $casservers;
  42 my $yamlauthfile = C4::Context->config('intranetdir') . "/C4/Auth_cas_servers.yaml";
  43
  44
  45 # If there's a configuration for multiple cas servers, then we get it
  46 if (multipleAuth()) {
  47     ($defaultcasserver, $casservers) = YAML::LoadFile($yamlauthfile);
  48     $defaultcasserver = $defaultcasserver->{'default'};
  49 } else {
  50 # Else, we fall back to casServerUrl syspref
  51     $defaultcasserver = 'default';
  52     $casservers = { 'default' => C4::Context->preference('casServerUrl') };
  53 }
  54
  55 # Is there a configuration file for multiple cas servers?
  56 sub multipleAuth {
  57     return (-e qq($yamlauthfile));
  58 }
  59
  60 # Returns configured CAS servers' list if multiple authentication is enabled
  61 sub getMultipleAuth {
  62    return $casservers;
  63 }
  64
  65 # Logout from CAS
  66 sub logout_cas {
  67     my ($query, $type) = @_;
  68     my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
  69     $uri =~ s/\?logout\.x=1//; # We don't want to keep triggering a logout, if we got here, the borrower is already logged out of Koha
  70     print $query->redirect( $cas->logout_url(url => $uri));
  71 }
  72
  73 # Login to CAS
  74 sub login_cas {
  75     my ($query, $type) = @_;
  76     my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
  77     print $query->redirect( $cas->login_url($uri));
  78 }
  79
  80 # Returns CAS login URL with callback to the requesting URL
  81 sub login_cas_url {
  82     my ( $query, $key, $type ) = @_;
  83     my ( $cas, $uri ) = _get_cas_and_service( $query, $key, $type );
  84     return $cas->login_url($uri);
  85 }
  86
  87 # Checks for password correctness
  88 # In our case : is there a ticket, is it valid and does it match one of our users ?
  89 sub checkpw_cas {
  90     $debug and warn "checkpw_cas";
  91     my ($dbh, $ticket, $query, $type) = @_;
  92     my $retnumber;
  93     my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
  94
  95     # If we got a ticket
  96     if ($ticket) {
  97         $debug and warn "Got ticket : $ticket";
  98
  99         # We try to validate it
 100         my $val = $cas->service_validate($uri, $ticket );
 101
 102         # If it's valid
 103         if ( $val->is_success() ) {
 104
 105             my $userid = $val->user();
 106             $debug and warn "User CAS authenticated as: $userid";
 107
 108             # Does it match one of our users ?
 109             my $sth = $dbh->prepare("select cardnumber from borrowers where userid=?");
 110             $sth->execute($userid);
 111             if ( $sth->rows ) {
 112                 $retnumber = $sth->fetchrow;
 113                 return ( 1, $retnumber, $userid );
 114             }
 115             $sth = $dbh->prepare("select userid from borrowers where cardnumber=?");
 116             $sth->execute($userid);
 117             if ( $sth->rows ) {
 118                 $retnumber = $sth->fetchrow;
 119                 return ( 1, $retnumber, $userid );
 120             }
 121
 122             # If we reach this point, then the user is a valid CAS user, but not a Koha user
 123             $debug and warn "User $userid is not a valid Koha user";
 124
 125         } else {
 126             $debug and warn "Problem when validating ticket : $ticket";
 127             $debug and warn "Authen::CAS::Client::Response::Error: " . $val->error() if $val->is_error();
 128             $debug and warn "Authen::CAS::Client::Response::Failure: " . $val->message() if $val->is_failure();
 129             $debug and warn Data::Dumper::Dumper($@) if $val->is_error() or $val->is_failure();
 130             return 0;
 131         }
 132     }
 133     return 0;
 134 }
 135
 136 # Proxy CAS auth
 137 sub check_api_auth_cas {
 138     $debug and warn "check_api_auth_cas";
 139     my ($dbh, $PT, $query, $type) = @_;
 140     my $retnumber;
 141     my ( $cas, $uri ) = _get_cas_and_service($query, undef, $type);
 142
 143     # If we have a Proxy Ticket
 144     if ($PT) {
 145         my $r = $cas->proxy_validate( $uri, $PT );
 146
 147         # If the PT is valid
 148         if ( $r->is_success ) {
 149
 150             # We've got a username !
 151             $debug and warn "User authenticated as: ", $r->user, "\n";
 152             $debug and warn "Proxied through:\n";
 153             $debug and warn "  $_\n" for $r->proxies;
 154
 155             my $userid = $r->user;
 156
 157             # Does it match one of our users ?
 158             my $sth = $dbh->prepare("select cardnumber from borrowers where userid=?");
 159             $sth->execute($userid);
 160             if ( $sth->rows ) {
 161                 $retnumber = $sth->fetchrow;
 162                 return ( 1, $retnumber, $userid );
 163             }
 164             $sth = $dbh->prepare("select userid from borrowers where cardnumber=?");
 165             return $r->user;
 166             $sth->execute($userid);
 167             if ( $sth->rows ) {
 168                 $retnumber = $sth->fetchrow;
 169                 return ( 1, $retnumber, $userid );
 170             }
 171
 172             # If we reach this point, then the user is a valid CAS user, but not a Koha user
 173             $debug and warn "User $userid is not a valid Koha user";
 174
 175         } else {
 176             $debug and warn "Proxy Ticket authentication failed";
 177             return 0;
 178         }
 179     }
 180     return 0;
 181 }
 182
 183 # Get CAS handler and service URI
 184 sub _get_cas_and_service {
 185     my $query = shift;
 186     my $key   = shift;    # optional
 187     my $type  = shift;
 188
 189     my $uri = _url_with_get_params($query, $type);
 190
 191     my $casparam = $defaultcasserver;
 192     $casparam = $query->param('cas') if defined $query->param('cas');
 193     $casparam = $key if defined $key;
 194     my $cas = Authen::CAS::Client->new( $casservers->{$casparam} );
 195
 196     return ( $cas, $uri );
 197 }
 198
 199 # Get the current URL with parameters contained directly into URL (GET params)
 200 # This method replaces $query->url() which will give both GET and POST params
 201 sub _url_with_get_params {
 202     my $query = shift;
 203     my $type = shift;
 204
 205     my $uri_base_part = ($type eq 'opac') ?
 206                         C4::Context->preference('OPACBaseURL') . get_script_name() :
 207                         C4::Context->preference('staffClientBaseURL');
 208
 209     my $uri_params_part = '';
 210     foreach my $param ( $query->url_param() ) {
 211         # url_param() always returns parameters that were deleted by delete()
 212         # This additional check ensure that parameter was not deleted.
 213         my $uriPiece = $query->param($param);
 214         if ($uriPiece) {
 215             $uri_params_part .= '&' if $uri_params_part;
 216             $uri_params_part .= $param . '=';
 217             $uri_params_part .= URI::Escape::uri_escape( $uriPiece );
 218         }
 219     }
 220     $uri_base_part .= '?' if $uri_params_part;
 221
 222     return $uri_base_part . $uri_params_part;
 223 }
 224
 225 1;
 226 __END__
 227
 228 =head1 NAME
 229
 230 C4::Auth - Authenticates Koha users
 231
 232 =head1 SYNOPSIS
 233
 234   use C4::Auth_with_cas;
 235
 236 =cut
 237
 238 =head1 SEE ALSO
 239
 240 CGI(3)
 241
 242 Authen::CAS::Client
 243
 244 =cut