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Diff for /loncom/auth/lonshibauth.pm between versions 1.4 and 1.14

version 1.4, 2021/05/04 18:47:37 version 1.14, 2021/12/12 20:49:26
Line 1 Line 1
 # The LearningOnline Network  # The LearningOnline Network
 # Redirect Shibboleth authentication to designated URL (/adm/sso).  # Redirect Single Sign On authentication to designated URL: 
   # /adm/sso, by default.
 #  #
 # $Id$  # $Id$
 #  #
Line 28 Line 29
   
 =head1 NAME  =head1 NAME
   
 Apache::lonshibauth - Redirect Shibboleth authentication  Apache::lonshibauth - Redirect Single Sign On authentication
   
 =head1 SYNOPSIS  =head1 SYNOPSIS
   
 Invoked when lonOtherAuthen is set to yes, and type is Shibboleth   Invoked when an Apache config file includes:
   PerlAuthenHandler Apache::lonshibauth
   
 If server is configured as a Shibboleth SP, the main Apache   If server is configured as a Shibboleth SP, the main Apache 
 configuration file, e.g.,  /etc/httpd/conf/httpd.conf  configuration file, e.g., /etc/httpd/conf/httpd.conf
 (for RHEL/CentOS/Scentific Linux/Fedora) should contain:  (for RHEL/CentOS/Scentific Linux/Fedora) should contain:
   
 LoadModule mod_shib /usr/lib/shibboleth/mod_shib_22.so  LoadModule mod_shib /usr/lib/shibboleth/mod_shib_22.so
Line 43  LoadModule mod_shib /usr/lib/shibboleth/ Line 45  LoadModule mod_shib /usr/lib/shibboleth/
 or equivalent (depending on Apache version)   or equivalent (depending on Apache version) 
 before the line to include conf/loncapa_apache.conf  before the line to include conf/loncapa_apache.conf
   
   If some other Apache module is in use for Single Sign On
   authentication e.g., mod_auth_cas or mod_sentinel,
   then a separate config file should be created which
   includes settings for the authentication module.
    
 =head1 INTRODUCTION  =head1 INTRODUCTION
   
 Redirects a user requiring Single Sign On via Shibboleth to a    Redirects a user requiring Single Sign On to a URL on the server  
 URL -- /adm/sso -- on the server which is configured to use that service.  which is configured to use that service. The default URL is:
   /adm/sso. 
   
   If this is to be used with a Single Sign On service other Shibboleth
   then an Apache config file needs to be loaded which: 
   
   (a) loads the corresponding Apache module, and 
   (b) sets appropriate values for perl vars in 
   an <IfModule mod_***></IfModule> block, and
   (c) sets an appropriate value for AuthType in a
   <Location /adm/sso><IfModule mod_***>
   </IfModule></Location> block, which also contains
   
   require valid-user
   
   PerlAuthzHandler       Apache::lonshibacc
   
   PerlAuthzHandler       Apache::lonacc 
   
   In the case of Shibboleth no additional file is needed
   because loncapa_apache.conf already contains:
   
   <IfModule mod_shib>
       PerlAuthenHandler Apache::lonshibauth
       PerlSetVar lonOtherAuthen yes
       PerlSetVar lonOtherAuthenType Shibboleth
   
   </IfModule>
   
   and
   
   <Location /adm/sso>
     Header set Cache-Control "private,no-store,no-cache,max-age=0"
     <IfModule mod_shib>
       AuthType shibboleth
       ShibUseEnvironment On
       ShibRequestSetting requireSession 1
       ShibRequestSetting redirectToSSL 443
       require valid-user
       PerlAuthzHandler       Apache::lonshibacc
       PerlAuthzHandler       Apache::lonacc
       ErrorDocument     403 /adm/login
       ErrorDocument     500 /adm/errorhandler
     </IfModule>
     <IfModule !mod_shib>
       PerlTypeHandler        Apache::lonnoshib
     </IfModule>
   
   </Location>
   
   If the service is not Shibboleth, then (optionally) a URL that is 
   not /adm/sso can be used as the URL for the service, e.g., /adm/cas
   or /adm/sentinel, by setting a lonOtherAuthenUrl perl var
   in an Apache config file containing (for example):
   
   PerlSetVar lonOtherAuthenUrl /adm/sentinel
   
   <IfModule mod_sentinel>
       PerlAuthenHandler Apache::lonshibauth
       PerlSetVar lonOtherAuthen yes
       PerlSetVar lonOtherAuthenType Sentinel
   
   </IfModule>
   
   <Location /adm/sentinel>
     Header set Cache-Control "private,no-store,no-cache,max-age=0"
     <IfModule mod_sentinel>
       AuthType Sentinel
       require valid-user
       PerlAuthzHandler  Apache::lonshibacc
       PerlAuthzHandler  Apache::lonacc
       ErrorDocument     403 /adm/login
       ErrorDocument     500 /adm/errorhandler
     </IfModule>
     <IfModule !mod_sentinel>
       PerlTypeHandler        Apache::lonnoshib
     </IfModule>
   
   </Location>
   
   In the example above for Sentinel SSO, it would also be possible to 
   use /adm/sso instead of /adm/sentinel, in which case (i) there would be 
   no need to define lonOtherAuthenUrl, (ii) there would be <Location /adm/sso> 
   and (iii) the <IfModule !></IfModule> block would not be needed as 
   it is already present in /etc/httpd/conf/loncapa_apache.conf.
   
 =head1 HANDLER SUBROUTINE  =head1 HANDLER SUBROUTINE
   
Line 54  This routine is called by Apache and mod Line 145  This routine is called by Apache and mod
   
 =over 4  =over 4
   
 If $r->user defined and requested uri not /adm/sso  If $r->user is defined and requested URL is not /adm/sso or
 redirect to /adm/sso  other specific URL as set by a lonOtherAuthenUrl perlvar,
   then redirect to /adm/sso (or to the specific URL).
   
   Otherwise return DECLINED.
   
   In the case of redirection a query string is appended,
   which will contain either (a) the originally requested URL,
   if not /adm/sso (or lonOtherAuthenUrl URL), and 
   any existing query string in the original request, or
   (b) if original request was for /tiny/domain/uniqueID,
   or if redirect is to /adm/login to support dual SSO and
   non-SSO, a query string which contains sso=tokenID, where the
   token contains information for deep-linking to course/resource. 
   
   Support is included for use of LON-CAPA's standard log-in
   page -- /adm/login -- to support dual SSO and non-SSO 
   authentication from that "landing" page.
   
   To enable dual SSO and non-SSO access from /adm/login
   a Domain Coordinator will use the web GUI:
   Main Menu > Set domain configuration > Display
   ("Log-in page options" checked) 
   and for any of the LON-CAPA domain's servers which
   will offer dual login will check "Yes" and then set:
   (a) SSO Text, Image, Alt Text, URL, Tool Tip
   (b) non-SSO: Text
   
   The value in the URL field should be /adm/sso,
   or the same URL as set for the lonOtherAuthenUrl
   perl var, e.g., /adm/sentinel.
   
 Otherwise return DECLINED  =back
   
   =head1 NOTABLE SUBROUTINES
   
   =over 4
   
   =item set_token()
   
   Inputs: 2
   $r - request object
   $lonhost - hostID of current server
   
   Output: 1
   $querystring - query string to append to URL
   when redirecting.
   
   If any of the following items are present in the original query string:
   role, symb, and linkkey, then they will be stored in the token file
   on the server, for access later to support deep-linking.  If the ltoken
   item is available, from successful launch from an LTI Consumer where
   LON-CAPA is the LTI Provider, but not configured to accept user 
   information, and the destination is a deep-link URL /tiny/domain/uniqueiD,
   then the LTI number, type (c or d), and tiny URL will be saved as the
   linkprot item in a token file.
   
 =back  =back
   
Line 68  package Apache::lonshibauth; Line 211  package Apache::lonshibauth;
 use strict;  use strict;
 use lib '/home/httpd/lib/perl/';  use lib '/home/httpd/lib/perl/';
 use Apache::lonnet;  use Apache::lonnet;
   use Apache::loncommon;
   use Apache::lonacc;
 use Apache::Constants qw(:common REDIRECT);  use Apache::Constants qw(:common REDIRECT);
 use LONCAPA qw(:DEFAULT);  use LONCAPA qw(:DEFAULT :match);
   
 sub handler {  sub handler {
     my $r = shift;      my $r = shift;
     my $target = '/adm/sso';      my $ssourl = '/adm/sso';
     if (($r->user eq '') && ($r->uri() ne $target)) {      if ($r->dir_config('lonOtherAuthenUrl') ne '') {
           $ssourl = $r->dir_config('lonOtherAuthenUrl');
       }
       my $target = $ssourl;
       if (&Apache::lonnet::get_saml_landing()) {
           $target = '/adm/login';
       }
       if (($r->user eq '') && ($r->uri ne $target) && ($r->uri ne $ssourl)) {
         my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};          my $lonhost = $Apache::lonnet::perlvar{'lonHostID'};
         my $hostname = &Apache::lonnet::hostname($lonhost);          my $hostname = &Apache::lonnet::hostname($lonhost);
         if (!$hostname) { $hostname = $r->hostname(); }          if (!$hostname) { $hostname = $r->hostname(); }
         my $protocol = $Apache::lonnet::protocol{$lonhost};          my $protocol = $Apache::lonnet::protocol{$lonhost};
         unless ($protocol eq 'https') { $protocol = 'http'; }          unless ($protocol eq 'https') { $protocol = 'http'; }
         my $alias = &Apache::lonnet::use_proxy_alias($r,$lonhost);          my $alias = &Apache::lonnet::use_proxy_alias($r,$lonhost);
         $hostname = $alias if ($alias ne '');          if (($alias ne '') &&
               (&Apache::lonnet::alias_sso($lonhost))) {
               $hostname = $alias;
           }
         my $dest = $protocol.'://'.$hostname.$target;          my $dest = $protocol.'://'.$hostname.$target;
         $r->subprocess_env;          if ($target eq '/adm/login') {
         if ($ENV{'QUERY_STRING'} ne '') {               my $querystring = &set_token($r,$lonhost);
             $dest .= '?'.$ENV{'QUERY_STRING'};               if ($querystring ne '') {
                    $dest .= '?'.$querystring;
                }
           } else {
               my $uri = $r->uri;
               if ($uri =~ m{^/tiny/$match_domain/\w+$}) {
                   my $querystring = &set_token($r,$lonhost);
                   if ($querystring ne '') {
                       $dest .= '?'.$querystring;
                   }
               } else {
                   if ($r->args ne '') {
                       $dest .= (($dest=~/\?/)?'&':'?').$r->args;
                   }
                   unless (($uri eq '/adm/roles') || ($uri eq '/adm/logout')) {
                       unless ($r->args =~ /origurl=/) {
                           $dest.=(($dest=~/\?/)?'&':'?').'origurl='.$uri;
                       }
                   }
               }
         }          }
         $r->header_out(Location => $dest);          $r->header_out(Location => $dest);
         return REDIRECT;          return REDIRECT;
Line 94  sub handler { Line 268  sub handler {
     }      }
 }  }
   
   sub set_token {
       my ($r,$lonhost) = @_;
       my ($firsturl,$querystring,$ssotoken,@names,%token);
       @names = ('role','symb','ltoken','linkkey');
       map { $token{$_} = 1; } @names;
       unless (($r->uri eq '/adm/roles') || ($r->uri eq '/adm/logout')) {
           $firsturl = $r->uri;
       }
       if ($r->args ne '') {
           &Apache::loncommon::get_unprocessed_cgi($r->args);
       }
       if ($r->uri =~ m{^/tiny/$match_domain/\w+$}) {
           if ($env{'form.ttoken'}) {
               my %info = &Apache::lonnet::tmpget($env{'form.ttoken'});
               &Apache::lonnet::tmpdel($env{'form.ttoken'});
               if ($info{'ltoken'}) {
                   $env{'form.ltoken'} = $info{'ltoken'};
               } elsif ($info{'linkkey'} ne '') {
                   $env{'form.linkkey'} = $info{'linkkey'};
               }
           } else {
               unless (($env{'form.ltoken'}) || ($env{'form.linkkey'})) {
                   &Apache::lonacc::get_posted_cgi($r,['linkkey']);
               }
           }
       }
       my $extras;
       foreach my $name (@names) {
           if ($env{'form.'.$name} ne '') {
               if ($name eq 'ltoken') {
                   my %info = &Apache::lonnet::tmpget($env{'form.ltoken'});
                   &Apache::lonnet::tmpdel($env{'form.ltoken'});
                   if ($info{'linkprot'}) {
                       $extras .= '&linkprot='.&escape($info{'linkprot'});
                       last;
                   }
               } else {
                   $extras .= '&'.$name.'='.&escape($env{'form.'.$name});
               }
           }
       }
       if (($firsturl ne '') || ($extras ne '')) {
           $extras .= ':sso';
           $ssotoken = &Apache::lonnet::reply('tmpput:'.&escape($firsturl).
                                              $extras,$lonhost);
           $querystring = 'sso='.$ssotoken;
       }
       if ($r->args ne '') {
           foreach my $key (sort(keys(%env))) {
               if ($key =~ /^form\.(.+)$/) {
                   my $name = $1;
                   next if (($token{$name}) || ($name eq 'ttoken'));
                   $querystring .= '&'.$name.'='.$env{$key};
               }
           }
       }
       return $querystring;
   }
   
 1;  1;
 __END__  __END__
Removed from v.1.4  
changed lines
  Added in v.1.14

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