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- If requested role is not an active role assisgned to the user, delete role
  form item and allow switch to the otherserver, instead of returning a 403.

    1: # The LearningOnline Network
    2: # Switch Servers Handler
    3: #
    4: # $Id: switchserver.pm,v 1.35 2016/12/16 15:31:11 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: package Apache::switchserver;
   30: 
   31: use strict;
   32: use Apache::Constants qw(:common);
   33: use Apache::lonnet;
   34: use Apache::lonmenu;
   35: use CGI::Cookie();
   36: use Apache::lonlocal;
   37: use LONCAPA qw(:DEFAULT :match);
   38: 
   39: sub init_env {
   40:     my ($r) = @_;
   41:     
   42:     if (-e $env{'user.environment'}) {
   43: 	return  $env{'user.environment'};
   44:     }
   45:     my $requrl=$r->uri;
   46:     my $handle= &Apache::lonnet::check_for_valid_session($r);
   47:     if ($handle ne '') {
   48: 	return undef;
   49:     }
   50:     my $lonidsdir=$r->dir_config('lonIDsDir');
   51:     &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
   52:     
   53:     return $r->dir_config('lonIDsDir')."/$handle.id";
   54: }
   55: 
   56: sub do_redirect {
   57:     my ($r,$url,$only_body,$extra_text) = @_;
   58:     $r->send_http_header;
   59:     my $start_page = 
   60: 	&Apache::loncommon::start_page('Switching Server ...',undef,
   61: 				       {'redirect'       => [0.5,$url],
   62: 					'only_body'      => $only_body,});
   63:     my $end_page   = &Apache::loncommon::end_page();
   64:     $r->print($start_page.$extra_text.$end_page);
   65:     unless ($env{'user.name'} eq 'public' && ($env{'user.domain'} eq 'public')) {
   66:         $r->register_cleanup(\&flush_course_logs);
   67:     }
   68:     return OK;
   69: }
   70: 
   71: sub flush_course_logs {
   72:     &Apache::lonnet::flushcourselogs();
   73:     return OK;
   74: }
   75: 
   76: sub handler {
   77:     my ($r) = @_;
   78:     
   79:     my $handle=&init_env($r);
   80:     if (!defined($handle)) { return FORBIDDEN; }
   81: 
   82:     &Apache::loncommon::get_unprocessed_cgi($ENV{'QUERY_STRING'},
   83: 				['otherserver','role','origurl','symb']);
   84: 
   85:     my $switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   86:     if (! $env{'form.otherserver'}) {
   87: 	$env{'form.otherserver'} =	
   88: 	    &Apache::lonnet::find_existing_session($env{'user.domain'},
   89: 						   $env{'user.name'});
   90: 	if (! $env{'form.otherserver'}) {
   91: 	    $env{'form.otherserver'} = 
   92: 		&Apache::lonnet::spareserver(30000,undef,1);
   93: 	}
   94: 	$switch_to=&Apache::lonnet::hostname($env{'form.otherserver'});
   95:     }
   96: 
   97:     if (!defined($switch_to)) { return FORBIDDEN; }
   98: 
   99:     my $protocol = 'http';
  100:     if ($env{'form.otherserver'}) {
  101:         if ($Apache::lonnet::protocol{$env{'form.otherserver'}} eq 'https') {
  102:             $protocol = $Apache::lonnet::protocol{$env{'form.otherserver'}};
  103:         }
  104:     } 
  105: 
  106:     if ($env{'user.name'} eq 'public'
  107: 	&& $env{'user.domain'} eq 'public') {
  108: 	my $url = $protocol.'://'.$switch_to.$r->uri;
  109: 	return &do_redirect($r,$url,1)
  110:     }
  111: 
  112:     my $skip_canhost_check = '';
  113:     if ($env{'form.role'}) {
  114:         if (!exists($env{'user.role.'.$env{'form.role'}})) {
  115:             delete($env{'form.role'});
  116:         } else {
  117:             my $now = time;
  118:             my ($start,$end) = split(/\./,$env{'user.role.'.$env{'form.role'}});
  119:             if (($start && $start > $now) || ($end && $end < $now)) {
  120:                 delete($env{'form.role'});
  121:             } elsif ($env{'form.role'} eq 'au./'.$env{'user.domain'}.'/') {
  122:                 if (&Apache::lonnet::homeserver($env{'user.name'},$env{'user.domain'}) eq $env{'form.otherserver'}) {
  123:                     $skip_canhost_check = 1;
  124:                 }
  125:             } elsif ($env{'form.role'} =~ m{^[ac]a\./($match_domain)/($match_username)$}) {
  126:                 if (&Apache::lonnet::homeserver($2,$1) eq $env{'form.otherserver'}) {
  127:                     $skip_canhost_check = 1; 
  128:                 }
  129:             }
  130:         }
  131:     }
  132: 
  133:     unless ($skip_canhost_check) {
  134:         my $canhost = 1;
  135:         my $uprimary_id = &Apache::lonnet::domain($env{'user.domain'},'primary');
  136:         my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
  137:         my @intdoms;
  138:         my $internet_names = &Apache::lonnet::get_internet_names($env{'form.otherserver'});
  139:         if (ref($internet_names) eq 'ARRAY') {
  140:             @intdoms = @{$internet_names};
  141:         }
  142:         unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
  143:             my $serverhomeID = &Apache::lonnet::get_server_homeID($switch_to);
  144:             my $serverhomedom = &Apache::lonnet::host_domain($serverhomeID);
  145:             my %defdomdefaults = &Apache::lonnet::get_domain_defaults($serverhomedom);
  146:             my %udomdefaults = &Apache::lonnet::get_domain_defaults($env{'user.domain'});
  147:             my $remoterev = &Apache::lonnet::get_server_loncaparev($env{'user.domain'},$env{'form.otherserver'});
  148:             $canhost = 
  149:                 &Apache::lonnet::can_host_session($env{'user.domain'},
  150:                                                   $env{'form.otherserver'},
  151:                                                   $remoterev,
  152:                                                   $udomdefaults{'remotesessions'},
  153:                                                   $defdomdefaults{'hostedsessions'});
  154:         }
  155:         unless ($canhost) { return FORBIDDEN; }
  156:     }
  157: 
  158:     #remove session env, and log event
  159:     unlink($handle);
  160:     my %temp=('switchserver' => time.':'.$env{'form.otherserver'},
  161: 	      $env{'form.role'});
  162:     &Apache::lonnet::put('email_status',\%temp);
  163:     my $logmsg = "Switch Server to $env{'form.otherserver'}";
  164:     if ($env{'form.role'}) {
  165:         $logmsg .= " with role: $env{'form.role'}";
  166:     } else {
  167:         $logmsg .= " (no role)";
  168:     }
  169:     $logmsg .= ' '.$ENV{'REMOTE_ADDR'};
  170:     &Apache::lonnet::log($env{'user.domain'},$env{'user.name'},
  171: 			 $env{'user.home'},$logmsg);
  172: 
  173:     &Apache::loncommon::content_type($r,'text/html');
  174: 
  175:     #expire the cookie
  176:     my $c = new CGI::Cookie(-name    => 'lonID',
  177: 			    -value   => '',
  178: 			    -expires => '-10y',);
  179:     $r->header_out('Set-cookie' => $c);
  180: 
  181:     if ($r->header_only) {
  182: 	$r->send_http_header;
  183: 	return OK;
  184:     }
  185: # -------------------------------------------------------- Menu script and info
  186: 	   
  187: # ---------------------------------------------------------------- Get handover
  188: 
  189:     my ($is_balancer) = &Apache::lonnet::check_loadbalancing($env{'user.name'},$env{'user.domain'});
  190:     my %info=('ip'       => $ENV{'REMOTE_ADDR'},
  191: 	      'domain'   => $env{'user.domain'},
  192: 	      'username' => $env{'user.name'},
  193: 	      'role'     => $env{'form.role'},
  194: 	      'server'   => $r->dir_config('lonHostID'),
  195: 	      'balancer' => $is_balancer);
  196:     if ($env{'form.origurl'}) {
  197:         $info{'origurl'} = $env{'form.origurl'};
  198:     }
  199:     if ($env{'form.symb'}) {
  200:         $info{'symb'} = $env{'form.symb'};
  201:     }
  202:     if ($env{'request.sso.login'}) {
  203: 	$info{'sso.login'} = $env{'request.sso.login'};
  204:     }
  205:     if ($env{'request.sso.reloginserver'}) {
  206:         $info{'sso.reloginserver'} = $env{'request.sso.reloginserver'};
  207:     }
  208:     my $token = &Apache::lonnet::tmpput(\%info,$env{'form.otherserver'});
  209:     my $url =$protocol.'://'.$switch_to.'/adm/login?'.
  210: 	'domain='.$env{'user.domain'}.
  211: 	'&amp;username='.$env{'user.name'}.
  212: 	'&amp;token='.$token;
  213: # --------------------------------------------------------------- Screen Output
  214:     return &do_redirect($r, $url, 0);
  215: }
  216: 
  217: 1;
  218: __END__
  219: 
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