--- loncom/auth/lonacc.pm	2021/01/02 22:11:26	1.159.2.17
+++ loncom/auth/lonacc.pm	2020/09/28 00:10:27	1.179
@@ -1,7 +1,7 @@
 # The LearningOnline Network
 # Cookie Based Access Handler
 #
-# $Id: lonacc.pm,v 1.159.2.17 2021/01/02 22:11:26 raeburn Exp $
+# $Id: lonacc.pm,v 1.179 2020/09/28 00:10:27 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -102,6 +102,7 @@ use Apache::loncommon();
 use Apache::lonlocal;
 use Apache::restrictedaccess();
 use Apache::blockedaccess();
+use Apache::lonprotected();
 use Fcntl qw(:flock);
 use LONCAPA qw(:DEFAULT :match);
 
@@ -202,6 +203,14 @@ sub get_posted_cgi {
 			$fname='';
 			$fmime='';
 		    }
+                    if ($i<$#lines && $lines[$i+1]=~/^Content\-Type\:\s*([\w\-\/]+)/i) {
+                        # TODO: something with $1 !
+                        $i++;
+                    }
+                    if ($i<$#lines && $lines[$i+1]=~/^Content\-transfer\-encoding\:\s*([\w\-\/]+)/i) {
+                        # TODO: something with $1 !
+                        $i++;
+                    }
 		    $i++;
 		}
 	    } else {
@@ -355,6 +364,14 @@ sub sso_login {
 	    # login but immediately go to switch server to find us a new 
 	    # machine
 	    &Apache::lonauth::success($r,$user,$domain,$home,'noredirect');
+            foreach my $item (keys(%form)) {
+                $env{'form.'.$item} = $form{$item};
+            }
+            unless ($form{'symb'}) {
+                unless (($r->uri eq '/adm/roles') || ($r->uri eq '/adm/sso')) {
+                    $env{'form.origurl'} = $r->uri;
+                }
+            }
             $env{'request.sso.login'} = 1;
             if (defined($r->dir_config("lonSSOReloginServer"))) {
                 $env{'request.sso.reloginserver'} =
@@ -369,7 +386,7 @@ sub sso_login {
 	} else {
 	    # need to login them in, so generate the need data that
 	    # migrate expects to do login
-            my $ip = $r->get_remote_host();
+	    my $ip = $r->get_remote_host();
 	    my %info=('ip'        => $ip,
 		      'domain'    => $domain,
 		      'username'  => $user,
@@ -435,6 +452,22 @@ sub sso_login {
     return undef;
 }
 
+sub needs_symb_check {
+    my ($requrl) = @_;
+    $requrl=~/\.(\w+)$/;
+    if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
+        ($requrl=~/^\/adm\/.*\/(aboutme|smppg|bulletinboard)(\?|$ )/x) ||
+        ($requrl=~/^\/adm\/wrapper\//) ||
+        ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
+        ($requrl=~m|\.problem/smpedit$|) ||
+        ($requrl=~/^\/public\/.*\/syllabus$/) ||
+        ($requrl=~/^\/adm\/(viewclasslist|navmaps)$/) ||
+        ($requrl=~/^\/adm\/.*\/aboutme\/portfolio(\?|$)/)) {
+        return 1;
+    }
+    return;
+}
+
 sub handler {
     my $r = shift;
     my $requrl=$r->uri;
@@ -520,7 +553,8 @@ sub handler {
             }
         } elsif ($env{'request.course.id'} &&
                  (($requrl =~ m{^/adm/$match_domain/$match_username/aboutme$}) ||
-                  ($requrl =~ m{^/public/$cdom/$cnum/syllabus$}))) {
+                  ($requrl eq "/public/$cdom/$cnum/syllabus") ||
+                  ($requrl =~ m{^/adm/$cdom/$cnum/\d+/ext\.tool$}))) {
             my $query = $r->args;
             if ($query) {
                 foreach my $pair (split(/&/,$query)) {
@@ -529,7 +563,6 @@ sub handler {
                         if ($value =~ /^supplemental/) {
                             $suppext = 1;
                         }
-                        last;
                     }
                 }
             }
@@ -542,6 +575,7 @@ sub handler {
             my $lonhost = &Apache::lonnet::host_from_dns($hostname);
             if ($lonhost) {
                 my $actual = &Apache::lonnet::absolute_url($hostname);
+                my $exphostname = &Apache::lonnet::hostname($lonhost);
                 my $expected = $Apache::lonnet::protocol{$lonhost}.'://'.$hostname;
                 unless ($actual eq $expected) {
                     $env{'request.use_absolute'} = $expected;
@@ -563,81 +597,60 @@ sub handler {
         if ($env{'user.noloadbalance'} eq $r->dir_config('lonHostID')) {
             $checkexempt = 1;
         }
-        unless (($checkexempt) || (($requrl eq '/adm/switchserver') && (!$r->is_initial_req()))) {
+        unless ($checkexempt) {
             ($is_balancer,$otherserver) =
                 &Apache::lonnet::check_loadbalancing($env{'user.name'},
                                                      $env{'user.domain'});
             if ($is_balancer) {
-                # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
-                my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
-                if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
-                    $otherserver = $found_server;
-                }
-                unless ($requrl eq '/adm/switchserver') {
-                    $r->set_handlers('PerlResponseHandler'=>
-                                     [\&Apache::switchserver::handler]);
+                unless (($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) {
+                    # Check if browser sent a LON-CAPA load balancer cookie (and this is a balancer)
+                    my ($found_server,$balancer_cookie) = &Apache::lonnet::check_for_balancer_cookie($r);
+                    if (($found_server) && ($balancer_cookie =~ /^\Q$env{'user.domain'}\E_\Q$env{'user.name'}\E_/)) {
+                        $otherserver = $found_server;
+                    }
                 }
+            }
+        }
+        if ($is_balancer) {
+            unless (($requrl eq '/adm/switchserver') && (!$r->is_initial_req())) {
+                $r->set_handlers('PerlResponseHandler'=>
+                                 [\&Apache::switchserver::handler]);
                 if ($otherserver ne '') {
                     $env{'form.otherserver'} = $otherserver;
                 }
-                unless (($env{'form.origurl'}) || ($r->uri eq '/adm/roles') ||
-                        ($r->uri eq '/adm/switchserver') || ($r->uri eq '/adm/sso')) {
-                    $env{'form.origurl'} = $r->uri;
-                }
+            }
+            unless (($env{'form.origurl'}) || ($r->uri eq '/adm/roles') ||
+                    ($r->uri eq '/adm/switchserver') || ($r->uri eq '/adm/sso')) {
+                $env{'form.origurl'} = $r->uri;
+            }
+        }
+        if ($requrl=~m{^/+tiny/+$match_domain/+\w+$}) {
+            if ($env{'user.name'} eq 'public' &&
+                $env{'user.domain'} eq 'public') {
+                $env{'request.firsturl'}=$requrl;
+                return FORBIDDEN;
+            } else {
+                return OK;
             }
         }
-
 # ---------------------------------------------------------------- Check access
 	my $now = time;
-        my ($check_symb,$check_access,$check_block,$access,$poss_symb);
 	if ($requrl !~ m{^/(?:adm|public|(?:prt|zip)spool)/}
 	    || $requrl =~ /^\/adm\/.*\/(smppg|bulletinboard)(\?|$ )/x) {
-            $check_access = 1;
-        }
-        if ((!$check_access) && ($env{'request.course.id'})) {
-            if (($requrl eq '/adm/viewclasslist') ||
-                ($requrl =~ m{^(/adm/wrapper|)\Q/uploaded/$cdom/$cnum/docs/\E}) ||
-                ($requrl =~ m{^/adm/.*/aboutme$}) ||
-                ($requrl=~m{^/adm/coursedocs/showdoc/})) {
-                $check_block = 1;
-            }
-        }
-        if (($env{'request.course.id'}) && (!$suppext)) {
-            $requrl=~/\.(\w+)$/;
-            if ((&Apache::loncommon::fileembstyle($1) eq 'ssi') ||
-                ($requrl=~/^\/adm\/.*\/(aboutme|smppg|bulletinboard)(\?|$ )/x) ||
-                ($requrl=~/^\/adm\/wrapper\//) ||
-                ($requrl=~m|^/adm/coursedocs/showdoc/|) ||
-                ($requrl=~m|\.problem/smpedit$|) ||
-                ($requrl=~/^\/public\/.*\/syllabus$/) ||
-                ($requrl=~/^\/adm\/(viewclasslist|navmaps)$/) ||
-                ($requrl=~/^\/adm\/.*\/aboutme\/portfolio(\?|$)/)) {
-                $check_symb = 1;
-            }
-        }
-        if (($check_access) || ($check_block)) {
-            if ($check_symb) {
+            my ($access,$poss_symb);
+            if (($env{'request.course.id'}) && (!$suppext) && (&needs_symb_check($requrl))) {
+                unless ($env{'form.symb'}) {
+                    if ($r->args) {
+                        &Apache::loncommon::get_unprocessed_cgi($r->args,['symb']);
+                    }
+                }
                 if ($env{'form.symb'}) {
                     $poss_symb=&Apache::lonnet::symbclean($env{'form.symb'});
-                } elsif (($env{'request.course.id'}) && ($r->args ne '')) {
-                    my $query = $r->args;
-                    foreach my $pair (split(/&/,$query)) {
-                        my ($name, $value) = split(/=/,$pair);
-                        $name = &unescape($name);
-                        $value =~ tr/+/ /;
-                        $value =~ s/%([a-fA-F0-9][a-fA-F0-9])/pack("C",hex($1))/eg;
-                        if ($name eq 'symb') {
-                            $poss_symb = &Apache::lonnet::symbclean($value);
-                            last;
-                        }
-                    }
                 }
                 if ($poss_symb) {
                     my ($possmap,$resid,$url)=&Apache::lonnet::decode_symb($poss_symb);
                     $url = &Apache::lonnet::clutter($url);
-                    my $toplevelmap = $env{'course.'.$env{'request.course.id'}.'.url'};
-                    unless (($url eq $requrl) && (($possmap eq $toplevelmap) ||
-                                                  (&Apache::lonnet::is_on_map($possmap)))) {
+                    unless (($url eq $requrl) && (&Apache::lonnet::is_on_map($possmap))) {
                         undef($poss_symb);
                     }
                     if ($poss_symb) {
@@ -655,18 +668,6 @@ sub handler {
             } else {
                 $access=&Apache::lonnet::allowed('bre',$requrl);
             }
-        }
-        if ($check_block) {
-            if ($access eq 'B') {
-                if ($poss_symb) {
-                    if (&Apache::lonnet::symbverify($poss_symb,$requrl)) {
-                        $env{'request.symb'} = $poss_symb;
-                    }
-                }
-                &Apache::blockedaccess::setup_handler($r);
-                return OK;
-            }
-        } elsif ($check_access) { 
             if ($handle eq '') {
                 unless ($access eq 'F') {
                     if ($requrl =~ m{^/res/$match_domain/$match_username/}) {
@@ -684,6 +685,9 @@ sub handler {
 	    }
             if ($access eq 'B') {
                 if ($poss_symb) {
+                    if ($requrl=~m{^(/adm/.*/aboutme)/portfolio$}) {
+                        $requrl = $1;
+                    }
                     if (&Apache::lonnet::symbverify($poss_symb,$requrl)) {
                         $env{'request.symb'} = $poss_symb;
                     }
@@ -691,6 +695,10 @@ sub handler {
                 &Apache::blockedaccess::setup_handler($r);
                 return OK;
             }
+            if ($access eq 'D') {
+                &Apache::lonprotected::setup_handler($r);
+                return OK;
+            }
 	    if (($access ne '2') && ($access ne 'F')) {
                 if ($requrl =~ m{^/res/}) {
                     $access = &Apache::lonnet::allowed('bro',$requrl);
@@ -738,7 +746,7 @@ sub handler {
 	    $env{'user.domain'} eq 'public' &&
 	    $requrl !~ m{^/+(res|public|uploaded)/} &&
 	    $requrl !~ m{^/adm/[^/]+/[^/]+/aboutme/portfolio$ }x &&
-            $requrl !~ m{^/adm/blockingstatus/.*$} &&
+        $requrl !~ m{^/adm/blockingstatus/.*$} &&
 	    $requrl !~ m{^/+adm/(help|logout|restrictedaccess|randomlabel\.png)}) {
 	    $env{'request.querystring'}=$r->args;
 	    $env{'request.firsturl'}=$requrl;
@@ -748,7 +756,7 @@ sub handler {
 	if ($env{'request.course.id'}) {
 	    &Apache::lonnet::countacc($requrl);
             my $query=$r->args;
-            if ($check_symb) {
+            if (&needs_symb_check($requrl)) {
 # ------------------------------------- This is serious stuff, get symb and log
 		my $symb;
 		if ($query) {
@@ -756,15 +764,15 @@ sub handler {
 		}
 		if ($env{'form.symb'}) {
 		    $symb=&Apache::lonnet::symbclean($env{'form.symb'});
-                    if ($requrl eq '/adm/navmaps') {
+		    if ($requrl eq '/adm/navmaps') {
                         my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
                         &Apache::lonnet::symblist($map,$murl => [$murl,$mid]);
-                    } elsif ($requrl =~ m|^/adm/wrapper/|
+		    } elsif ($requrl =~ m|^/adm/wrapper/|
 			|| $requrl =~ m|^/adm/coursedocs/showdoc/|) {
 			my ($map,$mid,$murl)=&Apache::lonnet::decode_symb($symb);
                         if ($map =~ /\.page$/) {
                             my $mapsymb = &Apache::lonnet::symbread($map);
-                            ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb);
+                            ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb); 
                         }
 			&Apache::lonnet::symblist($map,$murl => [$murl,$mid],
 						  'last_known' =>[$murl,$mid]);
@@ -791,62 +799,54 @@ sub handler {
                     if ($requrl=~m{^(/adm/.*/aboutme)/portfolio$}) {
                         $requrl = $1;
                     }
-		    $symb=&Apache::lonnet::symbread($requrl);
-                    if (&Apache::lonnet::is_on_map($requrl) && $symb) {
-                        my ($encstate,$invalidsymb);
-                        unless (&Apache::lonnet::symbverify($symb,$requrl,\$encstate)) {
-                            $invalidsymb = 1;
-                            #
-                            # If $env{'request.enc'} inconsistent with encryption expected for $symb
-                            # retrieved by lonnet::symbread(), call again to check for an instance of
-                            # $requrl in the course for which expected encryption matches request.enc.
-                            # If symb for different instance passes lonnet::symbverify(), use that as
-                            # the symb for $requrl and call &Apache::lonnet::allowed() for that symb.
-                            # Report invalid symb if there is no other symb. Redirect to /adm/ambiguous
-                            # if multiple possible symbs consistent with request.enc available for $requrl.
-                            #
-                            if (($env{'request.enc'} && !$encstate) || (!$env{'request.enc'} && $encstate)) {
-                                my %possibles;
-                                my $nocache = 1;
-                                my $oldsymb = $symb;
-                                $symb = &Apache::lonnet::symbread($requrl,'','','',\%possibles,$nocache);
-                                if (($symb) && ($symb ne $oldsymb)) {
-                                    if (&Apache::lonnet::symbverify($symb,$requrl)) {
-                                        my $access=&Apache::lonnet::allowed('bre',$requrl,$symb);
-                                        if ($access eq 'B') {
-                                            $env{'request.symb'} = $symb;
-                                            &Apache::blockedaccess::setup_handler($r);
-                                            return OK;
-                                        } elsif (($access eq '2') || ($access eq 'F')) {
+                    unless ($suppext) {
+		        $symb=&Apache::lonnet::symbread($requrl);
+                        if (&Apache::lonnet::is_on_map($requrl) && $symb) {
+                            my ($encstate,$invalidsymb);
+                            unless (&Apache::lonnet::symbverify($symb,$requrl,\$encstate)) {
+                                $invalidsymb = 1;
+                                #
+                                # If $env{'request.enc'} is true, but no encryption for $symb retrieved
+                                # by original lonnet::symbread() call, call again to check for an instance
+                                # of $requrl in the course which has encryption, and set that as the symb.
+                                # If there is no such symb, or symbverify() fails for the new symb proceed
+                                # to report invalid symb.
+                                #
+                                if ($env{'request.enc'} && !$encstate) {
+                                    my %possibles;
+                                    my $nocache = 1;
+                                    $symb = &Apache::lonnet::symbread($requrl,'','','',\%possibles,$nocache);
+                                    if ($symb) {
+                                        if (&Apache::lonnet::symbverify($symb,$requrl)) {
                                             $invalidsymb = '';
                                         }
+                                    } elsif (keys(%possibles) > 1) {
+                                        $r->internal_redirect('/adm/ambiguous');
+                                        return OK;
                                     }
-                                } elsif (keys(%possibles) > 1) {
-                                    $r->internal_redirect('/adm/ambiguous');
-                                    return OK;
                                 }
-                            }
-                            if ($invalidsymb) {
-                                $r->log_reason('Invalid symb for '.$requrl.': '.$symb);
-                                $env{'user.error.msg'}=
-                                    "$requrl:bre:1:1:Invalid Access";
-                                return HTTP_NOT_ACCEPTABLE;
+                                if ($invalidsymb) {
+                                    $r->log_reason('Invalid symb for '.$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($symb);
-                        if ($requrl eq '/adm/navmaps') {
-                            &Apache::lonnet::symblist($map,$murl =>[$murl,$mid]);
-                        } else {
-                            if (($map =~ /\.page$/) && ($requrl !~ /\.page$/)) {
-                                my $mapsymb = &Apache::lonnet::symbread($map);
-                                ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb);
+		        if ($symb) {
+			    my ($map,$mid,$murl)=
+			        &Apache::lonnet::decode_symb($symb);
+                            if ($requrl eq '/adm/navmaps') {
+                                &Apache::lonnet::symblist($map,$murl =>[$murl,$mid]);
+                            } else {
+                                if (($map =~ /\.page$/) && ($requrl !~ /\.page$/)) {
+                                    my $mapsymb = &Apache::lonnet::symbread($map);
+                                    ($map,$mid,$murl)=&Apache::lonnet::decode_symb($mapsymb);
+                                }
+			        &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
+						          'last_known' =>[$murl,$mid]);
                             }
-                            &Apache::lonnet::symblist($map,$murl =>[$murl,$mid],
-                                                      'last_known' =>[$murl,$mid]);
-                        }
+		        }
 		    }
 		}
 		$env{'request.symb'}=$symb;
@@ -898,7 +898,7 @@ sub handler {
 # ------------------------------------ See if this is a viewable portfolio file
     if (&Apache::lonnet::is_portfolio_url($requrl)) {
         my $clientip = $r->get_remote_host();
-	my $access=&Apache::lonnet::allowed('bre',$requrl,undef,undef,$clientip);
+        my $access=&Apache::lonnet::allowed('bre',$requrl,undef,undef,$clientip);
 	if ($access eq 'A') {
 	    &Apache::restrictedaccess::setup_handler($r);
 	    return OK;