--- loncom/auth/loncacc.pm 2007/10/02 01:09:59 1.46 +++ loncom/auth/loncacc.pm 2011/10/30 20:31:02 1.57 @@ -2,7 +2,7 @@ # Cookie Based Access Handler for Construction Area # (lonacc: 5/21/99,5/22,5/29,5/31 Gerd Kortemeyer) # -# $Id: loncacc.pm,v 1.46 2007/10/02 01:09:59 albertel Exp $ +# $Id: loncacc.pm,v 1.57 2011/10/30 20:31:02 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # @@ -27,6 +27,65 @@ # http://www.lon-capa.org/ # +=pod + +=head1 NAME + +Apache::lonacc - Cookie Based Access Handler for Construction Area + +=head1 SYNOPSIS + +Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf: + + PerlAccessHandler Apache::loncacc + +=head1 INTRODUCTION + +This module enables cookie based authentication for construction area +and is used to control access for the following two types of URI +(one for files, and one for directories): + + + + +Whenever the client sends the cookie back to the server, +if the cookie is missing or invalid, the user is re-challenged +for login information. + +This is part of the LearningOnline Network with CAPA project +described at http://www.lon-capa.org. + +=head1 HANDLER SUBROUTINE + +This routine is called by Apache and mod_perl. + +=over 4 + +=item * + +load POST parameters + +=item * + +store where they wanted to go (first url entered) + +=back + +=head1 OTHERSUBROUTINES + +=over + +=item constructaccess($url,$setpriv) + +See if the owner domain and name +in the URL match those in the expected environment. If so, return +two element list ($ownername,$ownerdomain). Else, return null string. +If 'setpriv' is set to 'setpriv', it actually assigns the privileges. +=back + +=cut + + package Apache::loncacc; use strict; @@ -38,26 +97,62 @@ use Apache::lonacc; use LONCAPA qw(:DEFAULT :match); sub constructaccess { - my ($url,$ownerdomain)=@_; - my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)($match_username)\//); - unless (($ownername) && ($ownerdomain)) { return ''; } - # We do not allow editing of previous versions of files. + my ($url,$setpriv)=@_; + +# We do not allow editing of previous versions of files if ($url=~/\.(\d+)\.(\w+)$/) { return ''; } - my @possibledomains = &Apache::lonnet::current_machine_domains(); - if ($ownername eq $env{'user.name'}) { - foreach my $domain (@possibledomains) { - if ($domain eq $env{'user.domain'}) { - return ($ownername,$domain); - } + +# Get username and domain from URL + my $londocroot = $Apache::lonnet::perlvar{'lonDocRoot'}; + my ($ownerdomain,$ownername)=($url=~ m{^(?:\Q$londocroot\E|)/priv/($match_domain)/($match_username)/}); + +# The URL does not really point to any authorspace, forget it + unless (($ownername) && ($ownerdomain)) { return ''; } + +# Now we need to see if the user has access to the authorspace of +# $ownername at $ownerdomain + + if (($ownername eq $env{'user.name'}) && ($ownerdomain eq $env{'user.domain'})) { +# Real author for this? + if (exists($env{'user.priv.au./'.$ownerdomain.'/./'})) { + return ($ownername,$ownerdomain); + } + } else { +# Co-author for this? + if (exists($env{'user.priv.ca./'.$ownerdomain.'/'.$ownername.'./'}) || + exists($env{'user.priv.aa./'.$ownerdomain.'/'.$ownername.'./'}) ) { + return ($ownername,$ownerdomain); } } - - foreach my $domain (@possibledomains) { - if (exists($env{'user.priv.ca./'.$domain.'/'.$ownername.'./'}) || - exists($env{'user.priv.aa./'.$domain.'/'.$ownername.'./'}) ) { - return ($ownername,$domain); - } +# We don't have any access right now. If we are not possibly going to do anything about this, +# we might as well leave + unless ($setpriv) { return ''; } + +# Backdoor access? + my $allowed=&Apache::lonnet::allowed('eco',$ownerdomain); +# Nope + unless ($allowed) { return ''; } +# Looks like we may have access, but could be locked by the owner of the construction space + if ($allowed eq 'U') { + my %blocked=&Apache::lonnet::get('environment',['domcoord.author'], + $ownerdomain,$ownername); +# Is blocked by owner + if ($blocked{'domcoord.author'} eq 'blocked') { return ''; } } + if (($allowed eq 'F') || ($allowed eq 'U')) { +# Grant temporary access + my $then=$env{'user.login.time'}; + my $update==$env{'user.update.time'}; + if (!$update) { $update = $then; } + my $refresh=$env{'user.refresh.time'}; + if (!$refresh) { $refresh = $update; } + my $now = time; + &Apache::lonnet::check_adhoc_privs($ownerdomain,$ownername, + $update,$refresh,$now,'ca', + 'constructaccess'); + return($ownername,$ownerdomain); + } +# No business here return ''; } @@ -82,7 +177,7 @@ sub handler { $env{'request.state'} = "construct"; $env{'request.filename'} = $r->filename; - unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) { + unless (&constructaccess($requrl,'setpriv')) { $r->log_reason("Unauthorized $requrl", $r->filename); return HTTP_NOT_ACCEPTABLE; } @@ -105,61 +200,6 @@ sub handler { 1; __END__ -=head1 NAME - -Apache::lonacc - Cookie Based Access Handler for Construction Area - -=head1 SYNOPSIS - -Invoked (for various locations) by /etc/httpd/conf/loncapa_apache.conf: - - PerlAccessHandler Apache::loncacc - -=head1 INTRODUCTION - -This module enables cookie based authentication for construction area -and is used to control access for three (essentially equivalent) URIs. - - - - - -Whenever the client sends the cookie back to the server, -if the cookie is missing or invalid, the user is re-challenged -for login information. - -This is part of the LearningOnline Network with CAPA project -described at http://www.lon-capa.org. - -=head1 HANDLER SUBROUTINE - -This routine is called by Apache and mod_perl. - -=over 4 - -=item * - -load POST parameters - -=item * - -store where they wanted to go (first url entered) - -=back - -=head1 OTHERSUBROUTINES - -=over 4 - -=item * - -constructaccess($url,$ownerdomain) : See if the owner domain and name -in the URL match those in the expected environment. If so, return -two element list ($ownername,$ownerdomain). Else, return null string. - -=back - -=cut