This file is indexed.

/usr/share/perl5/Authen/CAS/Client.pm is in libauthen-cas-client-perl 0.07-2.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
package Authen::CAS::Client;

require 5.006_001;

use strict;
use warnings;

use Authen::CAS::Client::Response;
use LWP::UserAgent;
use URI;
use URI::QueryParam;
use XML::LibXML;

our $VERSION = '0.07';


#======================================================================
# constructor
#

sub new {
  my ( $class, $cas, %args ) = @_;

  my $self = {
    _cas   => URI->new( $cas ),
    _ua    => LWP::UserAgent->new( agent => "Authen-CAS-Client/$VERSION" ),
    _fatal => $args{fatal} ? 1 : 0,
  };

  bless $self, $class;
}


#======================================================================
# private methods
#

sub _error {
  my ( $self, $error, $doc ) = @_;

  die $error
    if $self->{_fatal};

  Authen::CAS::Client::Response::Error->new( error => $error, doc => $doc );
}

sub _parse_auth_response {
  my ( $self, $xml ) = @_;

  my $doc = eval { XML::LibXML->new->parse_string( $xml ) };
  return $self->_error( 'Failed to parse XML', $xml )
    if $@;

  my ( $node, $response );

  eval {
    if( $node = $doc->find( '/cas:serviceResponse/cas:authenticationSuccess' )->get_node( 1 ) ) {
      $response = eval {
        my $user = $node->find( './cas:user' )->get_node( 1 )->textContent;

        my $iou = $node->find( './cas:proxyGrantingTicket' )->get_node( 1 );
        $iou = $iou->textContent
          if( defined $iou );

        my $proxies = $node->findnodes( './cas:proxies/cas:proxy' );
        $proxies = [ map $_->textContent, @$proxies ]
          if defined $proxies;

        Authen::CAS::Client::Response::AuthSuccess->new(
          user    => $user,
          iou     => $iou,
          proxies => $proxies,
          doc     => $doc,
        );
      };

      $response = $self->_error( 'Failed to parse authentication success response', $doc )
        if $@;
    }
    elsif( $node = $doc->find( '/cas:serviceResponse/cas:authenticationFailure' )->get_node( 1 ) ) {
      $response = eval {
        die
          unless $node->hasAttribute( 'code' );
        my $code = $node->getAttribute( 'code' );
        
        my $message = $node->textContent;
        s/^\s+//, s/\s+\z//
          for $message;

        Authen::CAS::Client::Response::AuthFailure->new(
          code    => $code,
          message => $message,
          doc     => $doc,
        );
      };

      $response = $self->_error( 'Failed to parse authentication failure response', $doc )
        if $@;
    }
    else {
      die;
    }
  };

  $response = $self->_error( 'Invalid CAS response', $doc )
    if $@;

  return $response;
}

sub _parse_proxy_response {
  my ( $self, $xml ) = @_;

  my $doc = eval { XML::LibXML->new->parse_string( $xml ) };
  return $self->_error( 'Failed to parse XML', $xml )
    if $@;

  my ( $node, $response );

  eval {
    if( $node = $doc->find( '/cas:serviceResponse/cas:proxySuccess' )->get_node( 1 ) ) {
      $response = eval {
        my $proxy_ticket = $node->find( './cas:proxyTicket' )->get_node( 1 )->textContent;

        Authen::CAS::Client::Response::ProxySuccess->new(
          proxy_ticket => $proxy_ticket,
          doc          => $doc,
        );
      };
      $response = $self->_error( 'Failed to parse proxy success response', $doc )
        if $@;
      }
    elsif( $node = $doc->find( '/cas:serviceResponse/cas:proxyFailure' )->get_node( 1 ) ) {
      $response = eval {
        die
          unless $node->hasAttribute( 'code' );
        my $code = $node->getAttribute( 'code' );
        
        my $message = $node->textContent;
        s/^\s+//, s/\s+\z//
          for $message;

        Authen::CAS::Client::Response::ProxyFailure->new(
          code    => $code,
          message => $message,
          doc     => $doc,
        );
      };
      $response = $self->_error( 'Failed to parse proxy failure response', $doc )
        if $@;
    }
    else {
      die;
    }
  };

  $response = $self->_error( 'Invalid CAS response', $doc )
    if $@;

  return $response;
}

sub _server_request {
  my ( $self, $path, $params ) = @_;

  my $url      = $self->_url( $path, $params )->canonical;
  my $response = $self->{_ua}->get( $url );

  unless( $response->is_success ) {
    return $self->_error(
      'HTTP request failed: ' . $response->code . ': ' . $response->message,
      $response->content
    );
  }

  return $response->content;
}

sub _url {
  my ( $self, $path, $params ) = @_;

  my $url = $self->{_cas}->clone;

  $url->path( $url->path . $path );
  $url->query_param_append( $_ => $params->{$_} )
    for keys %$params;

  return $url;
}

sub _v20_validate {
  my ( $self, $path, $service, $ticket, %args ) = @_;

  my %params = ( service => $service, ticket  => $ticket );

  $params{renew} = 'true'
    if $args{renew};
  $params{pgtUrl} = URI->new( $args{pgtUrl} )->canonical
    if defined $args{pgtUrl};

  my $content = $self->_server_request( $path, \%params );
  return $content
    if ref $content;

  return $self->_parse_auth_response( $content );
}


#======================================================================
# public methods
#

sub login_url {
  my ( $self, $service, %args ) = @_;

  my %params = ( service => $service );

  for ( qw/ renew gateway / ) {
    $params{$_} = 'true', last
      if $args{$_};
  }

  return $self->_url( '/login', \%params )->canonical;
}

sub logout_url {
  my ( $self, %args ) = @_;

  my %params;

  $params{url} = $args{url}
    if defined $args{url};

  return $self->_url( '/logout', \%params )->canonical;
}

sub validate {
  my ( $self, $service, $ticket, %args ) = @_;

  my %params = ( service => $service, ticket  => $ticket );

  $params{renew} = 'true'
    if $args{renew};

  my $content = $self->_server_request( '/validate', \%params );
  return $content
    if ref $content;

  my $response;

  if( $content =~ /^no\n\n\z/ ) {
    $response = Authen::CAS::Client::Response::AuthFailure->new( code => 'V10_AUTH_FAILURE', doc => $content );
  }
  elsif( $content =~ /^yes\n([^\n]+)\n\z/ ) {
    $response = Authen::CAS::Client::Response::AuthSuccess->new( user => $1, doc => $content );
  }
  else {
    $response = $self->_error( 'Invalid CAS response', $content );
  }

  return $response;
}

sub service_validate {
  my ( $self, $service, $ticket, %args ) = @_;
  return $self->_v20_validate( '/serviceValidate', $service, $ticket, %args );
}

sub proxy_validate {
  my ( $self, $service, $ticket, %args ) = @_;
  return $self->_v20_validate( '/proxyValidate', $service, $ticket, %args );
}

sub proxy {
  my ( $self, $pgt, $target ) = @_;

  my %params = ( pgt => $pgt, targetService => URI->new( $target ) );

  my $content = $self->_server_request( '/proxy', \%params );
  return $content
    if ref $content;

  return $self->_parse_proxy_response( $content );
}


1
__END__

=pod

=head1 NAME

Authen::CAS::Client - Provides an easy-to-use interface for authentication using JA-SIG's Central Authentication Service

=head1 SYNOPSIS

  use Authen::CAS::Client;

  my $cas = Authen::CAS::Client->new( 'https://example.com/cas' );


  # generate an HTTP redirect to the CAS login URL
  my $r = HTTP::Response->new( 302 );
  $r->header( Location => $cas->login_url );


  # generate an HTTP redirect to the CAS logout URL
  my $r = HTTP::Response->new( 302 );
  $r->header( Location => $cas->logout_url );


  # validate a service ticket (CAS v1.0)
  my $r = $cas->validate( $service, $ticket );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";
  }

  # validate a service ticket (CAS v2.0)
  my $r = $cas->service_validate( $service, $ticket );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";
  }


  # validate a service/proxy ticket (CAS v2.0)
  my $r = $cas->proxy_validate( $service, $ticket );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";
    print "Proxied through:\n";
    print "  $_\n"
      for $r->proxies;
  }


  # validate a service ticket and request a proxy ticket (CAS v2.0)
  my $r = $cas->service_validate( $server, $ticket, pgtUrl => $url );
  if( $r->is_success ) {
    print "User authenticated as: ", $r->user, "\n";

    unless( defined $r->iou ) {
      print "Service validation for proxying failed\n";
    }
    else {
      print "Proxy granting ticket IOU: ", $r->iou, "\n";

      ...
      # map IOU to proxy granting ticket via request to pgtUrl
      ...

      $r = $cas->proxy( $pgt, $target_service );
      if( $r->is_success ) {
        print "Proxy ticket issued: ", $r->proxy_ticket, "\n";
      }
    }
  }

=head1 DESCRIPTION

The Authen::CAS::Client module provides a simple interface for
authenticating users using JA-SIG's CAS protocol.  Both CAS v1.0
and v2.0 are supported.

=head1 METHODS

=head2 new $url [, %args]

C<new()> creates an instance of an C<Authen::CAS::Client> object.  C<$url>
refers to the CAS server's base URL.  C<%args> may contain the
following optional parameter:

=head3 fatal =E<gt> $boolean

If this argument is true, the CAS client will C<die()> when an error
occurs and C<$@> will contain the error message.  Otherwise an
C<Authen::CAS::Client::Response::Error> object will be returned.  See
L<Authen::CAS::Client::Response> for more detail on response objects.

=head2 login_url $service [, %args]

C<login_url()> returns the CAS server's login URL which can be used to
redirect users to start the authentication process.  C<$service> is the
service identifier that will be used during validation requests.
C<%args> may contain the following optional parameters:

=head3 renew =E<gt> $boolean

This causes the CAS server to force a user to re-authenticate even if
an SSO session is already present for that user.

=head3 gateway =E<gt> $boolean

This causes the CAS server to only rely on SSO sessions for authentication.
If an SSO session is not available for the current user, validation
will result in a failure.

=head2 logout_url [%args]

C<logout_url()> returns the CAS server's logout URL which can be used to
redirect users to end authenticated sessions.  C<%args> may contain
the following optional parameter:

=head3 url =E<gt> $url

If present, the CAS server will present the user with a link to the given
URL once the user has logged out.

=head2 validate $service, $ticket [, %args]

C<validate()> attempts to validate a service ticket using the CAS v1.0
protocol.  C<$service> is the service identifier that was passed to the
CAS server during the login process.  C<$ticket> is the service ticket
that was received after a successful authentication attempt.  Returns an
appropriate L<Authen::CAS::Client::Response> object.  C<%args> may
contain the following optional parameter:

=head3 renew =E<gt> $boolean

This will cause the CAS server to respond with a failure if authentication
validation was done via a CAS SSO session.

=head2 service_validate $service, $ticket [, %args]

C<service_validate()> attempts to validate a service ticket using the
CAS v2.0 protocol.  This is similar to C<validate()>, but allows for
greater flexibility when there is a need for proxying authentication
to back-end services.  The C<$service> and C<$ticket> parameters are
the same as above.  Returns an appropriate L<Authen::CAS::Client::Response>
object.  C<%args> may contain the following optional parameters:

=head3 renew =E<gt> $boolean

This will cause the CAS server to respond with a failure if authentication
validation was done via a CAS SSO session.

=head3 pgtUrl =E<gt> $url

This tells the CAS server that a proxy ticket needs to be issued for
proxying authentication to a back-end service.  C<$url> corresponds to
a callback URL that the CAS server will use to verify the service's
identity.  Per the CAS specification, this URL must be HTTPS.  If this
verification fails, normal validation will occur, but a proxy granting
ticket IOU will not be issued.

Also note that this call will block until the CAS server completes its
service verification attempt.  The returned proxy granting ticket IOU
can then be used to retrieve the proxy granting ticket that was passed
as a parameter to the given URL.

=head2 proxy_validate $service, $ticket [, %args]

C<proxy_validate()> is almost identical in operation to C<service_validate()>
except that both service tickets and proxy tickets can be used for
validation and a list of proxies will be provided if proxied authentication
has been used.  The C<$service> and C<$ticket> parameters are the same as
above.  Returns an appropriate L<Authen::CAS::Client::Response> object.
C<%args> may contain the following optional parameters:

=head3 renew =E<gt> $boolean

This is the same as described above.

=head3 pgtUrl =E<gt> $url

This is the same as described above.

=head2 proxy $pgt, $target

C<proxy()> is used to retrieve a proxy ticket that can be passed to
a back-end service for proxied authentication.  C<$pgt> is the proxy
granting ticket that was passed as a parameter to the C<pgtUrl>
specified in either C<service_validate()> or C<proxy_validate()>.
C<$target> is the service identifier for the back-end system that will
be using the returned proxy ticket for validation.  Returns an appropriate
L<Authen::CAS::Client::Response> object.

=head1 BUGS

None are known at this time, but if you find one, please feel free to
submit a report to the author.

=head1 AUTHOR

jason hord E<lt>pravus@cpan.orgE<gt>

=head1 SEE ALSO

=over 4

=item L<Authen::CAS::Client::Response>

=back

More information about CAS can be found at JA-SIG's CAS homepage:
L<http://www.ja-sig.org/products/cas/>

=head1 COPYRIGHT

Copyright (c) 2007-2014, jason hord

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.

=cut