--- loncom/auth/lonacc.pm	1999/10/13 17:48:52	1.1.1.1
+++ loncom/auth/lonacc.pm	2006/08/08 17:20:15	1.92
@@ -1,12 +1,141 @@
 # The LearningOnline Network
 # Cookie Based Access Handler
-# 5/21/99,5/22,5/29,5/31,6/15 Gerd Kortemeyer
+#
+# $Id: lonacc.pm,v 1.92 2006/08/08 17:20:15 albertel Exp $
+#
+# Copyright Michigan State University Board of Trustees
+#
+# This file is part of the LearningOnline Network with CAPA (LON-CAPA).
+#
+# LON-CAPA is free software; you can redistribute it and/or modify
+# it under the terms of the GNU General Public License as published by
+# the Free Software Foundation; either version 2 of the License, or
+# (at your option) any later version.
+#
+# LON-CAPA is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU General Public License for more details.
+#
+# You should have received a copy of the GNU General Public License
+# along with LON-CAPA; if not, write to the Free Software
+# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+#
+# /home/httpd/html/adm/gpl.txt
+#
+# http://www.lon-capa.org/
+#
+###
 
 package Apache::lonacc;
 
 use strict;
-use Apache::Constants qw(:common);
+use Apache::Constants qw(:common :http :methods);
+use Apache::File;
+use Apache::lonnet;
+use Apache::loncommon();
+use Apache::lonlocal;
+use Apache::restrictedaccess();
 use CGI::Cookie();
+use Fcntl qw(:flock);
+use LONCAPA;
+
+sub cleanup {
+    my ($r)=@_;
+    if (! $r->is_initial_req()) { return DECLINED; }
+    &Apache::lonnet::save_cache();
+    return OK;
+}
+
+sub goodbye {
+    my ($r)=@_;
+    &Apache::lonnet::goodbye();
+    return DONE;
+}
+
+###############################################
+
+sub get_posted_cgi {
+    my ($r) = @_;
+
+    my $buffer;
+    if ($r->header_in('Content-length')) {
+	$r->read($buffer,$r->header_in('Content-length'),0);
+    }
+    unless ($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($1))/eg;
+	    &Apache::loncommon::add_to_env("form.$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;
+		    }
+		    &Apache::loncommon::add_to_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";
+	    }
+	}
+    }
+#
+# Digested POSTed values
+#
+# Remember the way this was originally done (GET or POST)
+#
+    $env{'request.method'}=$ENV{'REQUEST_METHOD'};
+#
+# There may also be stuff in the query string
+# Tell subsequent handlers that this was GET, not POST, so they can access query string.
+# Also, unset POSTed content length to cover all tracks.
+#
+
+    $r->method_number(M_GET);
+
+    $r->method('GET');
+    $r->headers_in->unset('Content-length');
+}
 
 sub handler {
     my $r = shift;
@@ -14,30 +143,253 @@ sub handler {
     my %cookies=CGI::Cookie->parse($r->header_in('Cookie'));
     my $lonid=$cookies{'lonID'};
     my $cookie;
+    my $lonidsdir=$r->dir_config('lonIDsDir');
+
+    my $handle;
     if ($lonid) {
-	my $handle=$lonid->value;
+	$handle=$lonid->value;
         $handle=~s/\W//g;
-        my $lonidsdir=$r->dir_config('lonIDsDir');
-        if ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
-           return OK; 
-        } else { 
-           $r->log_reason("Cookie $handle not valid", $r->filename) 
-        };
-    }
-    $cookie=CGI::Cookie->new(-name  => 'lonURL',
-                             -value => $requrl, 
-                             -path  => '/');
-    $r->err_headers_out->add('Set-Cookie' => $cookie);
-    return FORBIDDEN;
+    }
+      
+    my ($sso_login);
+    if ($r->user 
+	&& (!$lonid || !-e "$lonidsdir/$handle.id" || $handle eq '') ) {
+	$sso_login = 1;
+	my $domain = $r->dir_config('lonDefDomain');
+	my $home=&Apache::lonnet::homeserver($r->user,$domain);
+	if ($home !~ /(con_lost|no_such_host)/) {
+	    $handle=&Apache::lonauth::success($r,$r->user,$domain,
+					     $home,'noredirect');
+	    $r->header_out('Set-cookie',"lonID=$handle; path=/");
+	}
+    }
+
+    if ($sso_login) {
+	&Apache::lonnet::appenv('request.sso.login' => 1);
+    }
+
+    if ($r->dir_config("lonBalancer") eq 'yes') {
+	$r->set_handlers('PerlResponseHandler'=>
+			 [\&Apache::switchserver::handler]);
+    }
+    
+    if ($handle eq '') {
+	$r->log_reason("Cookie $handle not valid", $r->filename); 
+    } elsif ((-e "$lonidsdir/$handle.id") && ($handle ne '')) {
+
+# ------------------------------------------------------ Initialize Environment
+
+	&Apache::lonnet::transfer_profile_to_env($lonidsdir,$handle);
+
+# --------------------------------------------------------- Initialize Language
+
+	&Apache::lonlocal::get_language_handle($r);
+
+    }
+
+# -------------------------------------------------- Should be a valid user now
+    if ($env{'user.name'} ne '' && $env{'user.domain'} ne '') {
+# -------------------------------------------------------------- Resource State
+
+	if ($requrl=~/^\/+(res|uploaded)\//) {
+	    $env{'request.state'} = "published";
+	} else {
+	    $env{'request.state'} = 'unknown';
+	}
+	$env{'request.filename'} = $r->filename;
+	$env{'request.noversionuri'} = &Apache::lonnet::deversion($requrl);
+# -------------------------------------------------------- Load POST parameters
+
+	&Apache::lonacc::get_posted_cgi($r);
+
+# ---------------------------------------------------------------- Check access
+	my $now = time;
+	if ($requrl!~/^\/adm|public|prtspool\//) {
+	    my $access=&Apache::lonnet::allowed('bre',$requrl);
+	    if ($access eq '1') {
+		$env{'user.error.msg'}="$requrl:bre:0:0:Choose Course";
+		return HTTP_NOT_ACCEPTABLE; 
+	    }
+	    if ($access eq 'A') {
+		&Apache::restrictedaccess::setup_handler($r);
+		return OK;
+	    }
+	    if (($access ne '2') && ($access ne 'F')) {
+		$env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
+		return HTTP_NOT_ACCEPTABLE; 
+	    }
+	}
+	if ($requrl =~ m|^/prtspool/|) {
+	    my $start='/prtspool/'.$env{'user.name'}.'_'.
+		$env{'user.domain'};
+	    if ($requrl !~ /^\Q$start\E/) {
+		$env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
+		return HTTP_NOT_ACCEPTABLE;
+	    }
+	}
+	if ($env{'user.name'} eq 'public' && 
+	    $env{'user.domain'} eq 'public' &&
+	    $requrl !~ m{^/+(res|public|uploaded)/} &&
+	    $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
+	    $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
+	    $env{'request.querystring'}=$r->args;
+	    $env{'request.firsturl'}=$requrl;
+	    return FORBIDDEN;
+	}
+# ------------------------------------------------------------- This is allowed
+	if ($env{'request.course.id'}) {
+	    &Apache::lonnet::countacc($requrl);
+	    $requrl=~/\.(\w+)$/;
+	    if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
+		($requrl=~/^\/adm\/.*\/(aboutme|navmaps|smppg|bulletinboard)(\?|$ )/x) ||
+		($requrl=~/^\/adm\/wrapper\//) ||
+		($requrl=~m|^/adm/coursedocs/showdoc/|) ||
+		($requrl=~m|\.problem/smpedit$|) ||
+		($requrl=~/^\/public\/.*\/syllabus$/)) {
+# ------------------------------------- This is serious stuff, get symb and log
+		my $query=$r->args;
+		my $symb;
+		if ($query) {
+		    &Apache::loncommon::get_unprocessed_cgi($query,['symb']);
+		}
+		if ($env{'form.symb'}) {
+		    $symb=&Apache::lonnet::symbclean($env{'form.symb'});
+		    if ($requrl =~ m|^/adm/wrapper/|
+			|| $requrl =~ m|^/adm/coursedocs/showdoc/|) {
+			my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
+			&Apache::lonnet::symblist($map,$murl => [$murl,$mid],
+						  'last_known' =>[$murl,$mid]);
+		    } elsif ((&Apache::lonnet::symbverify($symb,$requrl)) ||
+			     (($requrl=~m|(.*)/smpedit$|) &&
+			      &Apache::lonnet::symbverify($symb,$1))) {
+			my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
+			&Apache::lonnet::symblist($map,$murl => [$murl,$mid],
+						  'last_known' =>[$murl,$mid]);
+		    } else {
+			$r->log_reason('Invalid symb for '.$requrl.': '.
+				       $symb);
+			$env{'user.error.msg'}=
+			    "$requrl:bre:1:1:Invalid Access";
+			return HTTP_NOT_ACCEPTABLE; 
+		    }
+		} else {
+		    $symb=&Apache::lonnet::symbread($requrl);
+		    if (&Apache::lonnet::is_on_map($requrl) && $symb &&
+			!&Apache::lonnet::symbverify($symb,$requrl)) {
+			$r->log_reason('Invalid symb for '.$requrl.': '.$symb);
+			$env{'user.error.msg'}=
+			    "$requrl:bre:1:1:Invalid Access";
+			return HTTP_NOT_ACCEPTABLE; 
+		    }
+		    if ($symb) {
+			my ($map,$mid,$murl)=
+			    &Apache::lonnet::decode_symb($symb);
+			&Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
+						  'last_known' =>[$murl,$mid]);
+		    }
+		}
+		$env{'request.symb'}=$symb;
+		&Apache::lonnet::courseacclog($symb);
+	    } else {
+# ------------------------------------------------------- This is other content
+		&Apache::lonnet::courseacclog($requrl);    
+	    }
+	}
+	return OK;
+    }
+# -------------------------------------------- See if this is a public resource
+    if ($requrl=~m|^/+adm/+help/+|) {
+ 	return OK;
+    }
+# ------------------------------------ See if this is a viewable portfolio file
+    if (&Apache::lonnet::is_portfolio_url($requrl)) {
+	my $access=&Apache::lonnet::allowed('bre',$requrl);
+	if ($access eq 'A') {
+	    &Apache::restrictedaccess::setup_handler($r);
+	    return OK;
+	}
+	if (($access ne '2') && ($access ne 'F')) {
+	    $env{'user.error.msg'}="$requrl:bre:1:1:Access Denied";
+	    return HTTP_NOT_ACCEPTABLE;
+	}
+    }
+
+# -------------------------------------------------------------- Not authorized
+    $requrl=~/\.(\w+)$/;
+#    if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
+#        ($requrl=~/^\/adm\/(roles|logout|email|menu|remote)/) ||
+#        ($requrl=~m|^/prtspool/|)) {
+# -------------------------- Store where they wanted to go and get login screen
+	$env{'request.querystring'}=$r->args;
+	$env{'request.firsturl'}=$requrl;
+       return FORBIDDEN;
+#   } else {
+# --------------------------------------------------------------------- Goodbye
+#       return HTTP_BAD_REQUEST;
+#   }
 }
 
 1;
 __END__
 
+=head1 NAME
+
+Apache::lonacc - Cookie Based Access Handler
+
+=head1 SYNOPSIS
+
+Invoked (for various locations) by /etc/httpd/conf/srm.conf:
+
+ PerlAccessHandler       Apache::lonacc
+
+=head1 INTRODUCTION
+
+This module enables cookie based authentication and is used
+to control access for many different LON-CAPA URIs.
+
+Whenever the client sends the cookie back to the server, 
+this cookie is handled by either lonacc.pm or loncacc.pm
+(see srm.conf for what is invoked when).  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 *
+
+transfer profile into environment
+
+=item *
+
+load POST parameters
+
+=item *
+
+check access
+
+=item *
+
+if allowed, get symb, log, generate course statistics if applicable
+
+=item *
 
+otherwise return error
 
+=item *
 
+see if public resource
 
+=item *
 
+store attempted access
 
+=back
 
+=cut