--- loncom/auth/loncacc.pm 2001/11/29 19:12:44 1.17 +++ loncom/auth/loncacc.pm 2011/11/12 18:48:41 1.58 @@ -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 1.17 2001/11/29 19:12:44 www Exp $ +# $Id: loncacc.pm,v 1.58 2011/11/12 18:48:41 raeburn Exp $ # # Copyright Michigan State University Board of Trustees # @@ -26,160 +26,201 @@ # # http://www.lon-capa.org/ # -# 6/15,16/11,22/11, -# 01/06,01/11,6/1,9/25,9/28,11/22,12/25,12/26, -# 01/06/01,05/04,05/05,05/09 Gerd Kortemeyer + +=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 +three element list ($ownername,$ownerdomain,$ownerhome). + +Otherwise return the null string. + +If second argument 'setpriv' is true, it assigns the privileges, +and returns the same three element list, unless the owner has +blocked "ad hoc" Domain Coordinator access to the Author Space, +in which case the null string is returned. + +=back + +=cut + package Apache::loncacc; use strict; -use Apache::Constants qw(:common :http :methods); -use Apache::File; -use CGI::Cookie(); +use Apache::Constants qw(:common :http :methods REDIRECT); use Fcntl qw(:flock); +use Apache::lonlocal; +use Apache::lonnet; +use Apache::lonacc; +use LONCAPA qw(:DEFAULT :match); sub constructaccess { - my ($url,$ownerdomain)=@_; - my ($ownername)=($url=~/\/(?:\~|priv\/|home\/)(\w+)/); - unless (($ownername) && ($ownerdomain)) { return ''; } + my ($url,$setpriv)=@_; - if (($ownername eq $ENV{'user.name'}) && - ($ownerdomain eq $ENV{'user.domain'})) { - return ($ownername,$ownerdomain); - } +# We do not allow editing of previous versions of files + if ($url=~/\.(\d+)\.(\w+)$/) { return ''; } - my $capriv='user.priv.ca./'. - $ownerdomain.'/'.$ownername.'./'. - $ownerdomain.'/'.$ownername; - map { - if ($_ eq $capriv) { - return ($ownername,$ownerdomain); - } - } keys %ENV; +# Get username and domain from URL + my $londocroot = $Apache::lonnet::perlvar{'lonDocRoot'}; + my ($ownername,$ownerdomain,$ownerhome); + + ($ownerdomain,$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? + $ownerhome = $env{'user.home'}; + if (exists($env{'user.priv.au./'.$ownerdomain.'/./'})) { + return ($ownername,$ownerdomain,$ownerhome); + } + } else { +# Co-author for this? + if (exists($env{'user.priv.ca./'.$ownerdomain.'/'.$ownername.'./'}) || + exists($env{'user.priv.aa./'.$ownerdomain.'/'.$ownername.'./'}) ) { + $ownerhome = &Apache::lonnet::homeserver($ownername,$ownerdomain); + return ($ownername,$ownerdomain,$ownerhome); + } + } +# 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'); + $ownerhome = &Apache::lonnet::homeserver($ownername,$ownerdomain); + return($ownername,$ownerdomain,$ownerhome); + } +# No business here return ''; } sub handler { my $r = shift; my $requrl=$r->uri; - my %cookies=CGI::Cookie->parse($r->header_in('Cookie')); - my $lonid=$cookies{'lonID'}; - my $cookie; - if ($lonid) { - my $handle=$lonid->value; - $handle=~s/\W//g; - my $lonidsdir=$r->dir_config('lonIDsDir'); - if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) { - my @profile; - { - my $idf=Apache::File->new("$lonidsdir/$handle.id"); - flock($idf,LOCK_SH); - @profile=<$idf>; - $idf->close(); - } - my $envi; - for ($envi=0;$envi<=$#profile;$envi++) { - chomp($profile[$envi]); - my ($envname,$envvalue)=split(/=/,$profile[$envi]); - $ENV{$envname} = $envvalue; - } - $ENV{'user.environment'} = "$lonidsdir/$handle.id"; - $ENV{'request.state'} = "construct"; - $ENV{'request.filename'} = $r->filename; - - unless (&constructaccess($requrl,$r->dir_config('lonDefDomain'))) { - $r->log_reason("Unauthorized $requrl", $r->filename); - return HTTP_NOT_ACCEPTABLE; - } - -# -------------------------------------------------------- Load POST parameters - + $env{'request.editurl'}=$requrl; - my $buffer; + my $handle = &Apache::lonnet::check_for_valid_session($r); + if ($handle ne '') { - $r->read($buffer,$r->header_in('Content-length')); +# ------------------------------------------------------ Initialize Environment + my $lonidsdir=$r->dir_config('lonIDsDir'); + &Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle); - unless ($buffer=~/^(\-+\w+)\s+Content\-Disposition\:\s*form\-data/si) { - my @pairs=split(/&/,$buffer); - my $pair; - foreach $pair (@pairs) { - my ($name,$value) = split(/=/,$pair); - $value =~ tr/+/ /; - $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; - $name =~ tr/+/ /; - $name =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg; - $ENV{"form.$name"}=$value; - } - } else { - my $contentsep=$1; - my @lines = split (/\n/,$buffer); - my $name=''; - my $value=''; - my $fname=''; - my $fmime=''; - my $i; - for ($i=0;$i<=$#lines;$i++) { - if ($lines[$i]=~/^$contentsep/) { - if ($name) { - chomp($value); - if ($fname) { - $ENV{"form.$name.filename"}=$fname; - $ENV{"form.$name.mimetype"}=$fmime; - } else { - $value=~s/\s+$//s; - } - $ENV{"form.$name"}=$value; - } - if ($i<$#lines) { - $i++; - $lines[$i]=~ - /Content\-Disposition\:\s*form\-data\;\s*name\=\"([^\"]+)\"/i; - $name=$1; - $value=''; - if ($lines[$i]=~/filename\=\"([^\"]+)\"/i) { - $fname=$1; - if - ($lines[$i+1]=~/Content\-Type\:\s*([\w\-\/]+)/i) { - $fmime=$1; - $i++; - } else { - $fmime=''; - } - } else { - $fname=''; - $fmime=''; - } - $i++; - } - } else { - $value.=$lines[$i]."\n"; +# --------------------------------------------------------- Initialize Language + + &Apache::lonlocal::get_language_handle($r); + +# -------------------------------------------------------------- Resource State + + $env{'request.state'} = "construct"; + $env{'request.filename'} = $r->filename; + + my $allowed; + my ($ownername,$ownerdom,$ownerhome) = &constructaccess($requrl,'setpriv'); + if (($ownername ne '') && ($ownerdom ne '') && ($ownerhome ne '')) { + unless ($ownerhome eq 'no_host') { + my @hosts = &Apache::lonnet::current_machine_domains(); + if (grep(/^\Q$ownerhome\E$/,@hosts)) { + $allowed = 1; } } + } + + unless ($allowed) { + $r->log_reason("Unauthorized $requrl", $r->filename); + return HTTP_NOT_ACCEPTABLE; } - $r->method_number(M_GET); - $r->method('GET'); - $r->headers_in->unset('Content-length'); - - return OK; - } else { - $r->log_reason("Cookie $handle not valid", $r->filename) - }; + +# -------------------------------------------------------- Load POST parameters + + &Apache::lonacc::get_posted_cgi($r); + + return OK; + } else { + $r->log_reason("Cookie $handle not valid", $r->filename) } # ----------------------------------------------- Store where they wanted to go - $ENV{'request.firsturl'}=$requrl; + $env{'request.firsturl'}=$requrl; return FORBIDDEN; } 1; __END__ - - - - - - -