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- Bug 6914
  Domain configuration for WAF/Proxy includes Y/N option for use of alias in
  redirection to /adm/sso for server(s) supporting Shibboleth Single Sign On.

    1: # The LearningOnline Network
    2: # Redirect Shibboleth authentication to designated URL (/adm/sso).
    3: #
    4: # $Id: lonshibauth.pm,v 1.7 2021/10/07 15:51:16 raeburn Exp $
    5: #
    6: # Copyright Michigan State University Board of Trustees
    7: #
    8: # This file is part of the LearningOnline Network with CAPA (LON-CAPA).
    9: #
   10: # LON-CAPA is free software; you can redistribute it and/or modify
   11: # it under the terms of the GNU General Public License as published by
   12: # the Free Software Foundation; either version 2 of the License, or
   13: # (at your option) any later version.
   14: #
   15: # LON-CAPA is distributed in the hope that it will be useful,
   16: # but WITHOUT ANY WARRANTY; without even the implied warranty of
   17: # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   18: # GNU General Public License for more details.
   19: #
   20: # You should have received a copy of the GNU General Public License
   21: # along with LON-CAPA; if not, write to the Free Software
   22: # Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   23: #
   24: # /home/httpd/html/adm/gpl.txt
   25: #
   26: # http://www.lon-capa.org/
   27: #
   28: 
   29: =head1 NAME
   30: 
   31: Apache::lonshibauth - Redirect Shibboleth authentication
   32: 
   33: =head1 SYNOPSIS
   34: 
   35: Invoked when lonOtherAuthen is set to yes, and type is Shibboleth 
   36: 
   37: If server is configured as a Shibboleth SP, the main Apache 
   38: configuration file, e.g.,  /etc/httpd/conf/httpd.conf
   39: (for RHEL/CentOS/Scentific Linux/Fedora) should contain:
   40: 
   41: LoadModule mod_shib /usr/lib/shibboleth/mod_shib_22.so
   42: 
   43: or equivalent (depending on Apache version) 
   44: before the line to include conf/loncapa_apache.conf
   45: 
   46: =head1 INTRODUCTION
   47: 
   48: Redirects a user requiring Single Sign On via Shibboleth to a  
   49: URL -- /adm/sso -- on the server which is configured to use that service.
   50: 
   51: =head1 HANDLER SUBROUTINE
   52: 
   53: This routine is called by Apache and mod_perl.
   54: 
   55: =over 4
   56: 
   57: If $r->user defined and requested uri not /adm/sso
   58: redirect to /adm/sso
   59: 
   60: Otherwise return DECLINED
   61: 
   62: =back
   63: 
   64: =cut
   65: 
   66: package Apache::lonshibauth;
   67: 
   68: use strict;
   69: use lib '/home/httpd/lib/perl/';
   70: use Apache::lonnet;
   71: use Apache::Constants qw(:common REDIRECT);
   72: use LONCAPA qw(:DEFAULT);
   73: 
   74: sub handler {
   75:     my $r = shift;
   76:     my $target = '/adm/sso';
   77:     if (&Apache::lonnet::get_saml_landing()) {
   78:         $target = '/adm/login';
   79:     }
   80:     my $uri = $r->uri;
   81:     if (($r->user eq '') && ($uri ne $target) && ($uri ne '/adm/sso')) {
   82:         my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
   83:         my $hostname = &Apache::lonnet::hostname($lonhost);
   84:         if (!$hostname) { $hostname = $r->hostname(); }
   85:         my $protocol = $Apache::lonnet::protocol{$lonhost};
   86:         unless ($protocol eq 'https') { $protocol = 'http'; }
   87:         my $alias = &Apache::lonnet::use_proxy_alias($r,$lonhost);
   88:         if (($alias ne '') &&
   89:             (&Apache::lonnet::alias_shibboleth($lonhost))) {
   90:             $hostname = $alias;
   91:         }
   92:         my $dest = $protocol.'://'.$hostname.$target;
   93:         $r->subprocess_env;
   94:         if ($ENV{'QUERY_STRING'} ne '') {
   95:             $dest .= '?'.$ENV{'QUERY_STRING'};
   96:         }
   97:         unless (($uri eq '/adm/roles') || ($ENV{'QUERY_STRING'} =~ /origurl=/)) {
   98:             $dest.=(($dest=~/\?/)?'&':'?').'origurl='.$uri;
   99:         }
  100:         $r->header_out(Location => $dest);
  101:         return REDIRECT;
  102:     } else {
  103:         return DECLINED;
  104:     }
  105: }
  106: 
  107: 1;
  108: __END__