C4/Auth_with_shibboleth.pm

   1 package C4::Auth_with_shibboleth;
   2
   3 # Copyright 2014 PTFS Europe
   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 Modern::Perl;
  21
  22 use C4::Debug;
  23 use C4::Context;
  24 use Koha::AuthUtils qw(get_script_name);
  25 use Koha::Database;
  26 use Koha::Patrons;
  27 use C4::Members::Messaging;
  28 use Carp;
  29 use CGI;
  30 use List::MoreUtils qw(any);
  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 =
  39       qw(shib_ok logout_shib login_shib_url checkpw_shib get_login_shib);
  40 }
  41
  42 # Check that shib config is not malformed
  43 sub shib_ok {
  44     my $config = _get_shib_config();
  45
  46     if ($config) {
  47         return 1;
  48     }
  49
  50     return 0;
  51 }
  52
  53 # Logout from Shibboleth
  54 sub logout_shib {
  55     my ($query) = @_;
  56     my $uri = _get_uri();
  57     my $return = _get_return($query);
  58     print $query->redirect( $uri . "/Shibboleth.sso/Logout?return=$return" );
  59 }
  60
  61 # Returns Shibboleth login URL with callback to the requesting URL
  62 sub login_shib_url {
  63     my ($query) = @_;
  64
  65     my $target = _get_return($query);
  66     my $uri = _get_uri() . "/Shibboleth.sso/Login?target=" . $target;
  67
  68     return $uri;
  69 }
  70
  71 # Returns shibboleth user login
  72 sub get_login_shib {
  73
  74 # In case of a Shibboleth authentication, we expect a shibboleth user attribute
  75 # to contain the login match point of the shibboleth-authenticated user. This match
  76 # point is configured in koha-conf.xml
  77
  78 # Shibboleth attributes are mapped into http environmement variables, so we're getting
  79 # the match point of the user this way
  80
  81     # Get shibboleth config
  82     my $config = _get_shib_config();
  83
  84     my $matchAttribute = $config->{mapping}->{ $config->{matchpoint} }->{is};
  85
  86     if ( any { /(^psgi\.|^plack\.)/i } keys %ENV ) {
  87       $debug and warn $matchAttribute . " value: " . $ENV{"HTTP_".uc($matchAttribute)};
  88       return $ENV{"HTTP_".uc($matchAttribute)} || '';
  89     } else {
  90       $debug and warn $matchAttribute . " value: " . $ENV{$matchAttribute};
  91       return $ENV{$matchAttribute} || '';
  92     }
  93 }
  94
  95 # Checks for password correctness
  96 # In our case : does the given attribute match one of our users ?
  97 sub checkpw_shib {
  98     $debug and warn "checkpw_shib";
  99
 100     my ( $match ) = @_;
 101     my $config = _get_shib_config();
 102     $debug and warn "User Shibboleth-authenticated as: $match";
 103
 104     # Does the given shibboleth attribute value ($match) match a valid koha user ?
 105     my $borrowers = Koha::Patrons->search( { $config->{matchpoint} => $match } );
 106     if ( $borrowers->count > 1 ){
 107         # If we have more than 1 borrower the matchpoint is not unique
 108         # we cannot know which patron is the correct one, so we should fail
 109          $debug and warn "There are several users with $config->{matchpoint} of $match, matchpoints must be unique";
 110         return 0;
 111     }
 112     my $borrower = $borrowers->next;
 113     if ( defined($borrower) ) {
 114         if ($config->{'sync'}) {
 115             _sync($borrower->borrowernumber, $config, $match);
 116         }
 117         return ( 1, $borrower->get_column('cardnumber'), $borrower->get_column('userid') );
 118     }
 119
 120     if ( $config->{'autocreate'} ) {
 121         return _autocreate( $config, $match );
 122     } else {
 123         # If we reach this point, the user is not a valid koha user
 124          $debug and warn "User with $config->{matchpoint} of $match is not a valid Koha user";
 125         return 0;
 126     }
 127 }
 128
 129 sub _autocreate {
 130     my ( $config, $match ) = @_;
 131
 132     my %borrower = ( $config->{matchpoint} => $match );
 133
 134     while ( my ( $key, $entry ) = each %{$config->{'mapping'}} ) {
 135         if ( any { /(^psgi|^plack)/i } keys %ENV ) {
 136             $borrower{$key} = ( $entry->{'is'} && $ENV{"HTTP_" . uc($entry->{'is'}) } ) || $entry->{'content'} || '';
 137         } else {
 138             $borrower{$key} = ( $entry->{'is'} && $ENV{ $entry->{'is'} } ) || $entry->{'content'} || '';
 139         }
 140     }
 141
 142     my $patron = Koha::Patron->new( \%borrower )->store;
 143     C4::Members::Messaging::SetMessagingPreferencesFromDefaults( { borrowernumber => $patron->borrowernumber, categorycode => $patron->categorycode } );
 144
 145     return ( 1, $patron->cardnumber, $patron->userid );
 146 }
 147
 148 sub _sync {
 149     my ($borrowernumber, $config, $match ) = @_;
 150     my %borrower;
 151     $borrower{'borrowernumber'} = $borrowernumber;
 152     while ( my ( $key, $entry ) = each %{$config->{'mapping'}} ) {
 153         if ( any { /(^psgi|^plack)/i } keys %ENV ) {
 154             $borrower{$key} = ( $entry->{'is'} && $ENV{"HTTP_" . uc($entry->{'is'}) } ) || $entry->{'content'} || '';
 155         } else {
 156             $borrower{$key} = ( $entry->{'is'} && $ENV{ $entry->{'is'} } ) || $entry->{'content'} || '';
 157         }
 158     }
 159     my $patron = Koha::Patrons->find( $borrowernumber );
 160     $patron->set(\%borrower)->store;
 161 }
 162
 163 sub _get_uri {
 164
 165     my $protocol = "https://";
 166     my $interface = C4::Context->interface;
 167     $debug and warn "shibboleth interface: " . $interface;
 168
 169     my $uri;
 170     if ( $interface eq 'intranet' ) {
 171
 172         $uri = C4::Context->preference('staffClientBaseURL') // '';
 173         if ($uri eq '') {
 174             $debug and warn 'staffClientBaseURL not set!';
 175         }
 176     } else {
 177         $uri = C4::Context->preference('OPACBaseURL') // '';
 178         if ($uri eq '') {
 179             $debug and warn 'OPACBaseURL not set!';
 180         }
 181     }
 182
 183     if ($uri =~ /(.*):\/\/(.*)/) {
 184         my $oldprotocol = $1;
 185         if ($oldprotocol ne 'https') {
 186             $debug
 187                 and warn
 188                   'Shibboleth requires OPACBaseURL/staffClientBaseURL to use the https protocol!';
 189         }
 190         $uri = $2;
 191     }
 192     my $return = $protocol . $uri;
 193     return $return;
 194 }
 195
 196 sub _get_return {
 197     my ($query) = @_;
 198
 199     my $uri_base_part = _get_uri() . get_script_name();
 200
 201     my $uri_params_part = '';
 202     foreach my $param ( sort $query->url_param() ) {
 203         # url_param() always returns parameters that were deleted by delete()
 204         # This additional check ensure that parameter was not deleted.
 205         my $uriPiece = $query->param($param);
 206         if ($uriPiece) {
 207             $uri_params_part .= '&' if $uri_params_part;
 208             $uri_params_part .= $param . '=';
 209             $uri_params_part .= $uriPiece;
 210         }
 211     }
 212     $uri_base_part .= '%3F' if $uri_params_part;
 213
 214     return $uri_base_part . URI::Escape::uri_escape_utf8($uri_params_part);
 215 }
 216
 217 sub _get_shib_config {
 218     my $config = C4::Context->config('shibboleth');
 219
 220     if ( !$config ) {
 221         carp 'shibboleth config not defined' if $debug;
 222         return 0;
 223     }
 224
 225     if ( $config->{matchpoint}
 226         && defined( $config->{mapping}->{ $config->{matchpoint} }->{is} ) )
 227     {
 228         if ($debug) {
 229             warn "koha borrower field to match: " . $config->{matchpoint};
 230             warn "shibboleth attribute to match: "
 231               . $config->{mapping}->{ $config->{matchpoint} }->{is};
 232         }
 233         return $config;
 234     }
 235     else {
 236         if ( !$config->{matchpoint} ) {
 237             carp 'shibboleth matchpoint not defined';
 238         }
 239         else {
 240             carp 'shibboleth matchpoint not mapped';
 241         }
 242         return 0;
 243     }
 244 }
 245
 246 1;
 247 __END__
 248
 249 =head1 NAME
 250
 251 C4::Auth_with_shibboleth
 252
 253 =head1 SYNOPSIS
 254
 255 use C4::Auth_with_shibboleth;
 256
 257 =head1 DESCRIPTION
 258
 259 This module is specific to Shibboleth authentication in koha and relies heavily upon the native shibboleth service provider package in your operating system.
 260
 261 =head1 CONFIGURATION
 262
 263 To use this type of authentication these additional packages are required:
 264
 265 =over
 266
 267 =item *
 268
 269 libapache2-mod-shib2
 270
 271 =item *
 272
 273 libshibsp5:amd64
 274
 275 =item *
 276
 277 shibboleth-sp2-schemas
 278
 279 =back
 280
 281 We let the native shibboleth service provider packages handle all the complexities of shibboleth negotiation for us, and configuring this is beyond the scope of this documentation.
 282
 283 But to sum up, to get shibboleth working in koha, as a minimum you will need to:
 284
 285 =over
 286
 287 =item 1.
 288
 289 Create some metadata for your koha instance (if you're in a single instance setup then the default metadata available at https://youraddress.com/Shibboleth.sso/Metadata should be adequate)
 290
 291 =item 2.
 292
 293 Swap metadata with your Identidy Provider (IdP)
 294
 295 =item 3.
 296
 297 Map their attributes to what you want to see in koha
 298
 299 =item 4.
 300
 301 Tell apache that we wish to allow koha to authenticate via shibboleth.
 302
 303 This is as simple as adding the below to your virtualhost config (for CGI running):
 304
 305  <Location />
 306    AuthType shibboleth
 307    Require shibboleth
 308  </Location>
 309
 310 Or (for Plack running):
 311
 312  <Location />
 313    AuthType shibboleth
 314    Require shibboleth
 315    ShibUseEnvironment Off
 316    ShibUseHeaders On
 317  </Location>
 318
 319 IMPORTANT: Please note, if you are running in the plack configuration you should consult https://wiki.shibboleth.net/confluence/display/SHIB2/NativeSPSpoofChecking for security advice regarding header spoof checking settings. (See also bug 17776 on Bugzilla about enabling ShibUseHeaders.)
 320
 321 =item 5.
 322
 323 Configure koha to listen for shibboleth environment variables.
 324
 325 This is as simple as enabling B<useshibboleth> in koha-conf.xml:
 326
 327  <useshibboleth>1</useshibboleth>
 328
 329 =item 6.
 330
 331 Map shibboleth attributes to koha fields, and configure authentication match point in koha-conf.xml.
 332
 333  <shibboleth>
 334    <matchpoint>userid</matchpoint> <!-- koha borrower field to match upon -->
 335    <mapping>
 336      <userid is="eduPersonID"></userid> <!-- koha borrower field to shibboleth attribute mapping -->
 337    </mapping>
 338  </shibboleth>
 339
 340 Note: The minimum you need here is a <matchpoint> block, containing a valid column name from the koha borrowers table, and a <mapping> block containing a relation between the chosen matchpoint and the shibboleth attribute name.
 341
 342 =back
 343
 344 It should be as simple as that; you should now be able to login via shibboleth in the opac.
 345
 346 If you need more help configuring your B<S>ervice B<P>rovider to authenticate against a chosen B<Id>entity B<P>rovider then it might be worth taking a look at the community wiki L<page|http://wiki.koha-community.org/wiki/Shibboleth_Configuration>
 347
 348 =head1 FUNCTIONS
 349
 350 =head2 logout_shib
 351
 352 Sends a logout signal to the native shibboleth service provider and then logs out of koha.  Depending upon the native service provider configuration and identity provider capabilities this may or may not perform a single sign out action.
 353
 354   logout_shib($query);
 355
 356 =head2 login_shib_url
 357
 358 Given a query, this will return a shibboleth login url with return code to page with given given query.
 359
 360   my $shibLoginURL = login_shib_url($query);
 361
 362 =head2 get_login_shib
 363
 364 Returns the shibboleth login attribute should it be found present in the http session
 365
 366   my $shib_login = get_login_shib();
 367
 368 =head2 checkpw_shib
 369
 370 Given a shib_login attribute, this routine checks for a matching local user and if found returns true, their cardnumber and their userid.  If a match is not found, then this returns false.
 371
 372   my ( $retval, $retcard, $retuserid ) = C4::Auth_with_shibboleth::checkpw_shib( $shib_login );
 373
 374 =head2 _get_uri
 375
 376   _get_uri();
 377
 378 A sugar function to that simply returns the current page URI with appropriate protocol attached
 379
 380 This routine is NOT exported
 381
 382 =head2 _get_shib_config
 383
 384   my $config = _get_shib_config();
 385
 386 A sugar function that checks for a valid shibboleth configuration, and if found returns a hashref of it's contents
 387
 388 This routine is NOT exported
 389
 390 =head2 _autocreate
 391
 392   my ( $retval, $retcard, $retuserid ) = _autocreate( $config, $match );
 393
 394 Given a shibboleth attribute reference and a userid this internal routine will add the given user to Koha and return their user credentials.
 395
 396 This routine is NOT exported
 397
 398 =head1 SEE ALSO
 399
 400 =cut