--- loncom/lond	2017/05/09 03:04:21	1.536
+++ loncom/lond	2019/07/02 19:40:18	1.559
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.536 2017/05/09 03:04:21 raeburn Exp $
+# $Id: lond,v 1.559 2019/07/02 19:40:18 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -65,7 +65,7 @@ my $DEBUG = 0;		       # Non zero to ena
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.536 $'; #' stupid emacs
+my $VERSION='$Revision: 1.559 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -80,11 +80,12 @@ my $clientsamedom;              # LonCAP
                                 # and client.
 my $clientsameinst;             # LonCAPA "internet domain" same for 
                                 # this host and client.
-my $clientremoteok;             # Client allowed to host domain's users.
-                                # (version constraints ignored), not set
-                                # if this host and client share "internet domain". 
-my %clientprohibited;           # Actions prohibited on client;
- 
+my $clientremoteok;             # Current domain permits hosting on client
+                                # (not set if host and client share "internet domain").
+                                # Values are 0 or 1; 1 if allowed.
+my %clientprohibited;           # Commands from client prohibited for domain's
+                                # users.
+
 my $server;
 
 my $keymode;
@@ -108,6 +109,10 @@ my %perlvar;			# Will have the apache co
 my %secureconf;                 # Will have requirements for security 
                                 # of lond connections
 
+my %crlchecked;                 # Will contain clients for which the client's SSL
+                                # has been checked against the cluster's Certificate
+                                # Revocation List.
+
 my $dist;
 
 #
@@ -172,6 +177,7 @@ my @installerrors = ("ok",
 # shared    ("Access to other domain's content by this domain")
 # enroll    ("Enrollment in this domain's courses by others")
 # coaurem   ("Co-author roles for this domain's users elsewhere")
+# othcoau   ("Co-author roles in this domain for others")
 # domroles  ("Domain roles in this domain assignable to others")
 # catalog   ("Course Catalog for this domain displayed elsewhere")
 # reqcrs    ("Requests for creation of courses in this domain by others")
@@ -220,6 +226,7 @@ my %trust = (
                dcmaildump => {remote => 1, domroles => 1},
                dcmailput => {remote => 1, domroles => 1},
                del => {remote => 1, domroles => 1, enroll => 1, content => 1},
+               delbalcookie => {institutiononly => 1},
                deldom => {remote => 1, domroles => 1}, # not currently used
                devalidatecache => {institutiononly => 1},
                domroleput => {remote => 1, enroll => 1},
@@ -230,7 +237,7 @@ my %trust = (
                edit => {institutiononly => 1},  #not used currently
                eget => {remote => 1, domroles => 1, enroll => 1}, #not used currently
                egetdom => {remote => 1, domroles => 1, enroll => 1, },
-               ekey => {}, #not used currently
+               ekey => {anywhere => 1},
                exit => {anywhere => 1},
                fetchuserfile => {remote => 1, enroll => 1},
                get => {remote => 1, domroles => 1, enroll => 1},
@@ -295,9 +302,9 @@ my %trust = (
                store => {remote => 1, enroll => 1, reqcrs => 1,},
                studentphoto => {remote => 1, enroll => 1},
                sub => {content => 1,},
-               tmpdel => {anywhere => 1},
-               tmpget => {anywhere => 1},
-               tmpput => {anywhere => 1},
+               tmpdel => {institutiononly => 1},
+               tmpget => {institutiononly => 1},
+               tmpput => {remote => 1, othcoau => 1},
                tokenauthuserfile => {anywhere => 1},
                unsub => {content => 1,},
                update => {shared => 1},
@@ -420,10 +427,19 @@ sub SSLConnection {
     Debug("Approving promotion -> ssl");
     #  And do so:
 
+    my $CRLFile;
+    unless ($crlchecked{$clientname}) {
+        $CRLFile = lonssl::CRLFile();
+        $crlchecked{$clientname} = 1;
+    }
+
     my $SSLSocket = lonssl::PromoteServerSocket($Socket,
 						$CACertificate,
 						$Certificate,
-						$KeyFile);
+						$KeyFile,
+						$clientname,
+                                                $CRLFile,
+                                                $clientversion);
     if(! ($SSLSocket) ) {	# SSL socket promotion failed.
 	my $err = lonssl::LastError();
 	&logthis("<font color=\"red\"> CRITICAL "
@@ -779,10 +795,17 @@ sub ConfigFileFromSelector {
     my $selector   = shift;
     my $tablefile;
 
-    my $tabledir = $perlvar{'lonTabDir'}.'/';
-    if (($selector eq "hosts") || ($selector eq "domain") || 
-        ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
-	$tablefile =  $tabledir.$selector.'.tab';
+    if ($selector eq 'loncapaCAcrl') {
+        my $tabledir = $perlvar{'lonCertificateDirectory'};
+        if (-d $tabledir) {
+            $tablefile =  $tabledir.'/'.$selector.'.pem';
+        }
+    } else {
+        my $tabledir = $perlvar{'lonTabDir'}.'/';
+        if (($selector eq "hosts") || ($selector eq "domain") || 
+            ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
+	    $tablefile =  $tabledir.$selector.'.tab';
+        }
     }
     return $tablefile;
 }
@@ -806,12 +829,13 @@ sub PushFile {
     my ($command, $filename, $contents) = split(":", $request, 3);
     &Debug("PushFile");
     
-    #  At this point in time, pushes for only the following tables are
-    #  supported:
+    #  At this point in time, pushes for only the following tables and
+    #  CRL file are supported:
     #   hosts.tab  ($filename eq host).
     #   domain.tab ($filename eq domain).
     #   dns_hosts.tab ($filename eq dns_host).
-    #   dns_domain.tab ($filename eq dns_domain). 
+    #   dns_domain.tab ($filename eq dns_domain).
+    #   loncapaCAcrl.pem ($filename eq loncapaCAcrl).
     # Construct the destination filename or reject the request.
     #
     # lonManage is supposed to ensure this, however this session could be
@@ -832,7 +856,8 @@ sub PushFile {
 
     if($filename eq "host") {
 	$contents = AdjustHostContents($contents);
-    } elsif ($filename eq 'dns_host' || $filename eq 'dns_domain') {
+    } elsif (($filename eq 'dns_host') || ($filename eq 'dns_domain') ||
+             ($filename eq 'loncapaCAcrl')) {
         if ($contents eq '') {
             &logthis('<font color="red"> Pushfile: unable to install '
                     .$tablefile." - no data received from push. </font>");
@@ -843,8 +868,13 @@ sub PushFile {
             if ($managers{$clientip} eq $clientname) {
                 my $clientprotocol = $Apache::lonnet::protocol{$clientname};
                 $clientprotocol = 'http' if ($clientprotocol ne 'https');
-                my $url = '/adm/'.$filename;
-                $url =~ s{_}{/};
+                my $url;
+                if ($filename eq 'loncapaCAcrl') {
+                    $url = '/adm/dns/loncapaCRL';
+                } else {
+                    $url = '/adm/'.$filename;
+                    $url =~ s{_}{/};
+                }
                 my $request=new HTTP::Request('GET',"$clientprotocol://$clienthost$url");
                 my $response = LONCAPA::LWPReq::makerequest($clientname,$request,'',\%perlvar,60,0);
                 if ($response->is_error()) {
@@ -1606,12 +1636,14 @@ sub du2_handler {
 #
 #    1. for a directory, and the path does not begin with one of:
 #        (a) /home/httpd/html/res/<domain>
-#        (b) /home/httpd/html/res/userfiles/
+#        (b) /home/httpd/html/userfiles/
 #        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
 #    or is:
 #
-#    2. for a file, and the path (after prepending) does not begin with:
-#    /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#    2. for a file, and the path (after prepending) does not begin with one of:
+#        (a) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#        (b) /home/httpd/html/res/<domain>/<username>/
+#        (c) /home/httpd/html/userfiles/<domain>/<username>/
 #
 #    the response will be "refused".
 #
@@ -1642,8 +1674,8 @@ sub ls_handler {
     }
     if (-e $ulsdir) {
 	if(-d $ulsdir) {
-            unless (($ulsdir =~ m{/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
-                    ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/userfiles/})) {
+            unless (($ulsdir =~ m{^/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/userfiles})) {
                 &Failure($client,"refused\n",$userinput);
                 return 1;
             }
@@ -1670,7 +1702,8 @@ sub ls_handler {
 		closedir(LSDIR);
 	    }
 	} else {
-            unless ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/}) {
+            unless (($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/}) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(?:res|userfiles)/$LONCAPA::match_domain/$LONCAPA::match_name/})) {
                 &Failure($client,"refused\n",$userinput);
                 return 1;
             }
@@ -1703,12 +1736,14 @@ sub ls_handler {
 #
 #    1. for a directory, and the path does not begin with one of:
 #        (a) /home/httpd/html/res/<domain>
-#        (b) /home/httpd/html/res/userfiles/
+#        (b) /home/httpd/html/userfiles/
 #        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
 #    or is:
 #
-#    2. for a file, and the path (after prepending) does not begin with:
-#    /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#    2. for a file, and the path (after prepending) does not begin with one of:
+#        (a) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#        (b) /home/httpd/html/res/<domain>/<username>/
+#        (c) /home/httpd/html/userfiles/<domain>/<username>/
 #
 #    the response will be "refused".
 #
@@ -1738,8 +1773,8 @@ sub ls2_handler {
     }
     if (-e $ulsdir) {
         if(-d $ulsdir) {
-            unless (($ulsdir =~ m{/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
-                    ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/userfiles/})) {
+            unless (($ulsdir =~ m{^/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/userfiles})) {
                 &Failure($client,"refused\n","$userinput");
                 return 1;
             }
@@ -1767,7 +1802,8 @@ sub ls2_handler {
                 closedir(LSDIR);
             }
         } else {
-            unless ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/}) {
+            unless (($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/}) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(?:res|userfiles)/$LONCAPA::match_domain/$LONCAPA::match_name/})) {
                 &Failure($client,"refused\n",$userinput);
                 return 1;
             }
@@ -1792,14 +1828,17 @@ sub ls2_handler {
 #
 #    1. for a directory, and the path does not begin with one of:
 #        (a) /home/httpd/html/res/<domain>
-#        (b) /home/httpd/html/res/userfiles/
+#        (b) /home/httpd/html/userfiles/
 #        (c) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/userfiles
-#        (d) /home/httpd/html/priv/<domain>/ and client is the homeserver
+#        (d) /home/httpd/html/priv/<domain> and client is the homeserver
 #
 #    or is:
 #
-#    2. for a file, and the path (after prepending) does not begin with:
-#    /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#    2. for a file, and the path (after prepending) does not begin with one of:
+#        (a) /home/httpd/lonUsers/<domain>/<1>/<2>/<3>/<username>/
+#        (b) /home/httpd/html/res/<domain>/<username>/
+#        (c) /home/httpd/html/userfiles/<domain>/<username>/
+#        (d) /home/httpd/html/priv/<domain>/<username>/ and client is the homeserver
 #
 #    the response will be "refused".
 #
@@ -1873,17 +1912,43 @@ sub ls3_handler {
     my $rights;
     my $ulsout='';
     my $ulsfn;
+
+    my ($crscheck,$toplevel,$currdom,$currnum,$skip);
+    unless ($islocal) {
+        my ($major,$minor) = split(/\./,$clientversion);
+        if (($major < 2) || ($major == 2 && $minor < 12)) {
+            $crscheck = 1;
+        }
+    }
     if (-e $ulsdir) {
         if(-d $ulsdir) {
             unless (($getpropath) || ($getuserdir) ||
-                    ($ulsdir =~ m{/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
-                    ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/userfiles/}) ||
-                    (($ulsdir =~ m{/home/httpd/html/priv/$LONCAPA::match_domain/}) && ($islocal))) {
+                    ($ulsdir =~ m{^/home/httpd/html/(res/$LONCAPA::match_domain|userfiles/)}) ||
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/userfiles}) ||
+                    (($ulsdir =~ m{^/home/httpd/html/priv/$LONCAPA::match_domain}) && ($islocal))) {
                 &Failure($client,"refused\n",$userinput);
                 return 1;
             }
-            if (opendir(LSDIR,$ulsdir)) {
+            if (($crscheck) &&
+                ($ulsdir =~ m{^/home/httpd/html/res/($LONCAPA::match_domain)(/?$|/$LONCAPA::match_courseid)})) {
+                ($currdom,my $posscnum) = ($1,$2);
+                if (($posscnum eq '') || ($posscnum eq '/')) {
+                    $toplevel = 1;
+                } else {
+                    $posscnum =~ s{^/+}{};
+                    if (&LONCAPA::Lond::is_course($currdom,$posscnum)) {
+                        $skip = 1;
+                    }
+                }
+            }
+            if ((!$skip) && (opendir(LSDIR,$ulsdir))) {
                 while ($ulsfn=readdir(LSDIR)) {
+                    if (($crscheck) && ($toplevel) && ($currdom ne '') &&
+                        ($ulsfn =~ /^$LONCAPA::match_courseid$/) && (-d "$ulsdir/$ulsfn")) {
+                        if (&LONCAPA::Lond::is_course($currdom,$ulsfn)) {
+                            next;
+                        }
+                    }
                     undef($obs);
                     undef($rights);
                     my @ulsstats=stat($ulsdir.'/'.$ulsfn);
@@ -1907,7 +1972,9 @@ sub ls3_handler {
             }
         } else {
             unless (($getpropath) || ($getuserdir) ||
-                    ($ulsdir =~ m{/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_username/})) {
+                    ($ulsdir =~ m{^/home/httpd/lonUsers/$LONCAPA::match_domain(?:/[\w\-.@]){3}/$LONCAPA::match_name/}) ||
+                    ($ulsdir =~ m{^/home/httpd/html/(?:res|userfiles)/$LONCAPA::match_domain/$LONCAPA::match_name/}) ||
+                    (($ulsdir =~ m{^/home/httpd/html/priv/$LONCAPA::match_domain/$LONCAPA::match_name/}) && ($islocal))) {
                 &Failure($client,"refused\n",$userinput);
                 return 1;
             }
@@ -1963,7 +2030,7 @@ sub read_lonnet_global {
                 }
                 if ($what eq 'perlvar') {
                     if (!exists($packagevars{$what}{'lonBalancer'})) {
-                        if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
+                        if ($dist =~ /^(centos|rhes|fedora|scientific|oracle)/) {
                             my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
                             if (ref($othervarref) eq 'HASH') {
                                 $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
@@ -2059,8 +2126,8 @@ sub server_distarch_handler {
 sub server_certs_handler {
     my ($cmd,$tail,$client) = @_;
     my $userinput = "$cmd:$tail";
-    my $result;
-    my $result = &LONCAPA::Lond::server_certs(\%perlvar);
+    my $hostname = &Apache::lonnet::hostname($perlvar{'lonHostID'});
+    my $result = &LONCAPA::Lond::server_certs(\%perlvar,$perlvar{'lonHostID'},$hostname);
     &Reply($client,\$result,$userinput);
     return;
 }
@@ -2281,12 +2348,84 @@ sub change_password_handler {
     }
     if($validated) {
 	my $realpasswd  = &get_auth_type($udom, $uname); # Defined since authd.
-	
 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
+        my $notunique;
 	if ($howpwd eq 'internal') {
 	    &Debug("internal auth");
             my $ncpass = &hash_passwd($udom,$npass);
-	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
+            my (undef,$method,@rest) = split(/!/,$contentpwd);
+            if ($method eq 'bcrypt') {
+                my %passwdconf = &Apache::lonnet::get_passwdconf($udom);
+                if (($passwdconf{'numsaved'}) && ($passwdconf{'numsaved'} =~ /^\d+$/)) {
+                    my @oldpasswds;
+                    my $userpath = &propath($udom,$uname);
+                    my $fullpath = $userpath.'/oldpasswds';
+                    if (-d $userpath) {
+                        my @oldfiles;
+                        if (-e $fullpath) {
+                            if (opendir(my $dir,$fullpath)) {
+                                (@oldfiles) = grep(/^\d+$/,readdir($dir));
+                                closedir($dir);
+                            }
+                            if (@oldfiles) {
+                                @oldfiles = sort { $b <=> $a } (@oldfiles);
+                                my $numremoved = 0;
+                                for (my $i=0; $i<@oldfiles; $i++) {
+                                    if ($i>=$passwdconf{'numsaved'}) {
+                                        if (-f "$fullpath/$oldfiles[$i]") {
+                                            if (unlink("$fullpath/$oldfiles[$i]")) {
+                                                $numremoved ++;
+                                            }
+                                        }
+                                    } elsif (open(my $fh,'<',"$fullpath/$oldfiles[$i]")) {
+                                        while (my $line = <$fh>) {
+                                            push(@oldpasswds,$line);
+                                        }
+                                        close($fh);
+                                    }
+                                }
+                                if ($numremoved) {
+                                    &logthis("unlinked $numremoved old password files for $uname:$udom");
+                                }
+                            }
+                        }
+                        push(@oldpasswds,$contentpwd);
+                        foreach my $item (@oldpasswds) {
+                            my (undef,$method,@rest) = split(/!/,$item);
+                            if ($method eq 'bcrypt') {
+                                my $result = &hash_passwd($udom,$npass,@rest);
+                                if ($result eq $item) {
+                                    $notunique = 1;
+                                    last;
+                                }
+                            }
+                        }
+                        unless ($notunique) {
+                            unless (-e $fullpath) {
+                                if (&mkpath("$fullpath/")) {
+                                    chmod(0700,$fullpath);
+                                }
+                            }
+                            if (-d $fullpath) {
+                                my $now = time;
+                                if (open(my $fh,'>',"$fullpath/$now")) {
+                                    print $fh $contentpwd;
+                                    close($fh);
+                                    chmod(0400,"$fullpath/$now");
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+            if ($notunique) {
+                my $msg="Result of password change for $uname:$udom - password matches one used before";
+                if ($lonhost) {
+                    $msg .= " - request originated from: $lonhost";
+                }
+                &logthis($msg);
+                &Reply($client, "prioruse\n", $userinput);
+	    } elsif (&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
 		my $msg="Result of password change for $uname: pwchange_success";
                 if ($lonhost) {
                     $msg .= " - request originated from: $lonhost";
@@ -2314,7 +2453,6 @@ sub change_password_handler {
 	    #
 	    &Failure( $client, "auth_mode_error\n", $userinput);
 	}  
-	
     } else {
 	if ($failure eq '') {
 	    $failure = 'non_authorized';
@@ -2591,32 +2729,26 @@ sub update_resource_handler {
 		my $transname="$fname.in.transfer";
 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
 		my $response;
-# FIXME: cannot replicate files that take more than two minutes to transfer?
-#		alarm(120);
-# FIXME: this should use the LWP mechanism, not internal alarms.
-                alarm(1200);
-		{
-		    my $request=new HTTP::Request('GET',"$remoteurl");
-                    $response=&LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,0,1);
-		}
-		alarm(0);
+# FIXME: cannot replicate files that take more than two minutes to transfer -- needs checking now 1200s timeout used
+# for LWP request.
+		my $request=new HTTP::Request('GET',"$remoteurl");
+                $response=&LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,0,1);
 		if ($response->is_error()) {
-# FIXME: we should probably clean up here instead of just whine
-		    unlink($transname);
+                    my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
+                    &devalidate_meta_cache($fname);
+                    if (-e $transname) {
+                        unlink($transname);
+                    }
+                    unlink($fname);
 		    my $message=$response->status_line;
 		    &logthis("LWP GET: $message for $fname ($remoteurl)");
 		} else {
 		    if ($remoteurl!~/\.meta$/) {
-# FIXME: isn't there an internal LWP mechanism for this?
-			alarm(120);
-			{
-			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
-                            my $mresponse = &LONCAPA::LWPReq::makerequest($clientname,$mrequest,$fname.'.meta',\%perlvar,120,0,1);
-			    if ($mresponse->is_error()) {
-				unlink($fname.'.meta');
-			    }
+			my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
+                        my $mresponse = &LONCAPA::LWPReq::makerequest($clientname,$mrequest,$fname.'.meta',\%perlvar,120,0,1);
+			if ($mresponse->is_error()) {
+			    unlink($fname.'.meta');
 			}
-			alarm(0);
 		    }
                     # we successfully transfered, copy file over to real name
 		    rename($transname,$fname);
@@ -2686,17 +2818,13 @@ sub fetch_user_file_handler {
 	my $remoteurl=$clientprotocol.'://'.$clienthost.'/userfiles/'.$fname;
 	my $response;
 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
-	alarm(1200);
-	{
-	    my $request=new HTTP::Request('GET',"$remoteurl");
-            my $verifycert = 1;
-            my @machine_ids = &Apache::lonnet::current_machine_ids();
-            if (grep(/^\Q$clientname\E$/,@machine_ids)) {
-                $verifycert = 0;
-            }
-            $response = &LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,$verifycert);
-	}
-	alarm(0);
+	my $request=new HTTP::Request('GET',"$remoteurl");
+        my $verifycert = 1;
+        my @machine_ids = &Apache::lonnet::current_machine_ids();
+        if (grep(/^\Q$clientname\E$/,@machine_ids)) {
+            $verifycert = 0;
+        }
+        $response = &LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,$verifycert);
 	if ($response->is_error()) {
 	    unlink($transname);
 	    my $message=$response->status_line;
@@ -5467,6 +5595,58 @@ sub tmp_del_handler {
 &register_handler("tmpdel", \&tmp_del_handler, 0, 1, 0);
 
 #
+#  Process the delbalcookie command. This command deletes a balancer
+#  cookie in the lonBalancedir directory created by switchserver
+#
+# Parameters:
+#   $cmd      - Command that got us here.
+#   $cookie   - Cookie to be deleted.
+#   $client   - socket open on the client process.
+#
+# Returns:
+#   1     - Indicating processing should continue.
+# Side Effects:
+#   A cookie file is deleted from the lonBalancedir directory
+#   A reply is sent to the client.
+sub del_balcookie_handler {
+    my ($cmd, $cookie, $client) = @_;
+
+    my $userinput= "$cmd:$cookie";
+
+    chomp($cookie);
+    my $deleted = '';
+    if ($cookie =~ /^$LONCAPA::match_domain\_$LONCAPA::match_username\_[a-f0-9]{32}$/) {
+        my $execdir=$perlvar{'lonBalanceDir'};
+        if (-e "$execdir/$cookie.id") {
+            if (open(my $fh,'<',"$execdir/$cookie.id")) {
+                my $dodelete;
+                while (my $line = <$fh>) {
+                    chomp($line);
+                    if ($line eq $clientname) {
+                        $dodelete = 1;
+                        last;
+                    }
+                }
+                close($fh);
+                if ($dodelete) {
+                    if (unlink("$execdir/$cookie.id")) {
+                        $deleted = 1;
+                    }
+                }
+            }
+        }
+    }
+    if ($deleted) {
+        &Reply($client, "ok\n", $userinput);
+    } else {
+        &Failure( $client, "error: ".($!+0)."Unlinking cookie file Failed ".
+                  "while attempting delbalcookie\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("delbalcookie", \&del_balcookie_handler, 0, 1, 0);
+
+#
 #   Processes the setannounce command.  This command
 #   creates a file named announce.txt in the top directory of
 #   the documentn root and sets its contents.  The announce.txt file is
@@ -5745,9 +5925,10 @@ sub validate_course_section_handler {
 # Formal Parameters:
 #    $cmd     - The command request that got us dispatched.
 #    $tail    - The tail of the command.   In this case this is a colon separated
-#               set of words that will be split into:
+#               set of values that will be split into:
 #               $inst_class  - Institutional code for the specific class section   
-#               $courseowner - The escaped username:domain of the course owner 
+#               $ownerlist   - An escaped comma-separated list of username:domain 
+#                              of the course owner, and co-owner(s).
 #               $cdom        - The domain of the course from the institution's
 #                              point of view.
 #    $client  - The socket open on the client.
@@ -5772,6 +5953,56 @@ sub validate_class_access_handler {
 &register_handler("autovalidateclass_sec", \&validate_class_access_handler, 0, 1, 0);
 
 #
+#   Validate course owner or co-owners(s) access to enrollment data for all sections
+#   and crosslistings for a particular course.
+#
+#
+# Formal Parameters:
+#    $cmd     - The command request that got us dispatched.
+#    $tail    - The tail of the command.   In this case this is a colon separated
+#               set of values that will be split into:
+#               $ownerlist   - An escaped comma-separated list of username:domain
+#                              of the course owner, and co-owner(s).
+#               $cdom        - The domain of the course from the institution's
+#                              point of view.
+#               $classes     - Frozen hash of institutional course sections and
+#                              crosslistings.
+#    $client  - The socket open on the client.
+# Returns:
+#    1 - continue processing.
+#
+
+sub validate_classes_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($ownerlist,$cdom,$classes) = split(/:/, $tail);
+    my $classesref = &Apache::lonnet::thaw_unescape($classes);
+    my $owners = &unescape($ownerlist);
+    my $result;
+    eval {
+        local($SIG{__DIE__})='DEFAULT';
+        my %validations;
+        my $response = &localenroll::check_instclasses($owners,$cdom,$classesref,
+                                                       \%validations);
+        if ($response eq 'ok') {
+            foreach my $key (keys(%validations)) {
+                $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($validations{$key}).'&';
+            }
+            $result =~ s/\&$//;
+        } else {
+            $result = 'error';
+        }
+    };
+    if (!$@) {
+        &Reply($client, \$result, $userinput);
+    } else {
+        &Failure($client,"unknown_cmd\n",$userinput);
+    }
+    return 1;
+}
+&register_handler("autovalidateinstclasses", \&validate_classes_handler, 0, 1, 0);
+
+#
 #   Create a password for a new LON-CAPA user added by auto-enrollment.
 #   Only used for case where authentication method for new user is localauth
 #
@@ -6805,8 +7036,8 @@ my $wwwid=getpwnam('www');
 if ($wwwid!=$<) {
    my $emailto="$perlvar{'lonAdmEMail'},$perlvar{'lonSysEMail'}";
    my $subj="LON: $currenthostid User ID mismatch";
-   system("echo 'User ID mismatch.  lond must be run as user www.' |\
- mailto $emailto -s '$subj' > /dev/null");
+   system("echo 'User ID mismatch.  lond must be run as user www.' |".
+          " mail -s '$subj' $emailto > /dev/null");
    exit 1;
 }
 
@@ -6940,10 +7171,10 @@ sub UpdateHosts {
 
     my %oldconf = %secureconf;
     my %connchange;
-    if (lonssl::Read_Connect_Config(\%secureconf,\%perlvar) eq 'ok') {
-        logthis('<font color="blue"> Reloaded SSL connection rules </font>');
+    if (lonssl::Read_Connect_Config(\%secureconf,\%perlvar,\%crlchecked) eq 'ok') {
+        logthis('<font color="blue"> Reloaded SSL connection rules and cleared CRL checking history </font>');
     } else {
-        logthis('<font color="yellow"> Failed to reload SSL connection rules </font>');
+        logthis('<font color="yellow"> Failed to reload SSL connection rules and clear CRL checking history </font>');
     }
     if ((ref($oldconf{'connfrom'}) eq 'HASH') && (ref($secureconf{'connfrom'}) eq 'HASH')) {
         foreach my $type ('dom','intdom','other') {
@@ -7222,7 +7453,7 @@ if ($arch eq 'unknown') {
     chomp($arch);
 }
 
-unless (lonssl::Read_Connect_Config(\%secureconf,\%perlvar) eq 'ok') {
+unless (lonssl::Read_Connect_Config(\%secureconf,\%perlvar,\%crlchecked) eq 'ok') {
     &logthis('<font color="blue">No connectionrules table. Will fallback to loncapa.conf</font>');
 }
 
@@ -7311,7 +7542,7 @@ sub make_new_child {
         &Authen::Krb5::init_context();
 
         my $no_ets;
-        if ($dist =~ /^(?:centos|rhes|scientific)(\d+)$/) {
+        if ($dist =~ /^(?:centos|rhes|scientific|oracle)(\d+)$/) {
             if ($1 >= 7) {
                 $no_ets = 1;
             }
@@ -7356,7 +7587,7 @@ sub make_new_child {
 	    $ConnectionType = "manager";
 	    $clientname = $managers{$outsideip};
 	}
-	my ($clientok,$clientinfoset);
+	my $clientok;
 
 	if ($clientrec || $ismanager) {
 	    &status("Waiting for init from $clientip $clientname");
@@ -7457,7 +7688,6 @@ sub make_new_child {
 		    }
 	   
 		} else {
-                    $clientinfoset = &set_client_info();
 		    my $ok = InsecureConnection($client);
 		    if($ok) {
 			$clientok = 1;
@@ -7495,34 +7725,7 @@ sub make_new_child {
 # ------------------------------------------------------------ Process requests
 	    my $keep_going = 1;
 	    my $user_input;
-            unless ($clientinfoset) {
-                $clientinfoset = &set_client_info();
-            }
-            $clientremoteok = 0;
-            unless ($clientsameinst) {
-                $clientremoteok = 1;
-                my $defdom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
-                %clientprohibited = &get_prohibited($defdom);
-                if ($clientintdom) {
-                    my $remsessconf = &get_usersession_config($defdom,'remotesession');
-                    if (ref($remsessconf) eq 'HASH') {
-                        if (ref($remsessconf->{'remote'}) eq 'HASH') {
-                            if (ref($remsessconf->{'remote'}->{'excludedomain'}) eq 'ARRAY') {
-                                if (grep(/^\Q$clientintdom\E$/,@{$remsessconf->{'remote'}->{'excludedomain'}})) {
-                                    $clientremoteok = 0;
-                                }
-                            }
-                            if (ref($remsessconf->{'remote'}->{'includedomain'}) eq 'ARRAY') {
-                                if (grep(/^\Q$clientintdom\E$/,@{$remsessconf->{'remote'}->{'includedomain'}})) {
-                                    $clientremoteok = 1;
-                                } else {
-                                    $clientremoteok = 0;
-                                }
-                            }
-                        }
-                    }
-                }
-            }
+
 	    while(($user_input = get_request) && $keep_going) {
 		alarm(120);
 		Debug("Main: Got $user_input\n");
@@ -7555,22 +7758,30 @@ sub make_new_child {
 
 #
 #  Used to determine if a particular client is from the same domain
-#  as the current server, or from the same internet domain.
+#  as the current server, or from the same internet domain, and
+#  also if the client can host sessions for the domain's users.
+#  A hash is populated with keys set to commands sent by the client
+#  which may not be executed for this domain.
 #
 #  Optional input -- the client to check for domain and internet domain.
 #  If not specified, defaults to the package variable: $clientname
 #
 #  If called in array context will not set package variables, but will
 #  instead return an array of two values - (a) true if client is in the
-#  same domain as the server, and (b) true if client is in the same internet
-#  domain.
+#  same domain as the server, and (b) true if client is in the same 
+#  internet domain.
 #
 #  If called in scalar context, sets package variables for current client:
 #
-#  $clienthomedom  - LonCAPA domain of homeID for client.
-#  $clientsamedom  - LonCAPA domain same for this host and client.
-#  $clientintdom   - LonCAPA "internet domain" for client.
-#  $clientsameinst - LonCAPA "internet domain" same for this host & client.
+#  $clienthomedom    - LonCAPA domain of homeID for client.
+#  $clientsamedom    - LonCAPA domain same for this host and client.
+#  $clientintdom     - LonCAPA "internet domain" for client.
+#  $clientsameinst   - LonCAPA "internet domain" same for this host & client.
+#  $clientremoteok   - If current domain permits hosting on this client: 1
+#  %clientprohibited - Commands prohibited for domain's users for this client.
+#
+#  if the host and client have the same "internet domain", then the value
+#  of $clientremoteok is not used, and no commands are prohibited.
 #
 #  returns 1 to indicate package variables have been set for current client.
 #
@@ -7582,7 +7793,7 @@ sub set_client_info {
     my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
     my $homedom = &Apache::lonnet::host_domain($clientserverhomeID);
     my $samedom = 0;
-    if ($perlvar{'lonDefDom'} eq $homedom) {
+    if ($perlvar{'lonDefDomain'} eq $homedom) {
         $samedom = 1;
     }
     my $intdom = &Apache::lonnet::internet_dom($clientserverhomeID);
@@ -7602,6 +7813,13 @@ sub set_client_info {
         $clientsamedom = $samedom;
         $clientintdom = $intdom;
         $clientsameinst = $sameinst;
+        if ($clientsameinst) {
+            undef($clientremoteok);
+            undef(%clientprohibited);
+        } else {
+            $clientremoteok = &get_remote_hostable($currentdomainid);
+            %clientprohibited = &get_prohibited($currentdomainid);
+        }
         return 1;
     }
 }
@@ -8317,6 +8535,14 @@ sub make_passwd_file {
 		$result = "pass_file_failed_error";
 	    }
 	}
+    } elsif ($umode eq 'lti') {
+        my $pf = IO::File->new(">$passfilename");
+        if($pf) {
+            print $pf "lti:\n";
+            &update_passwd_history($uname,$udom,$umode,$action);
+        } else {
+            $result = "pass_file_failed_error";
+        }
     } else {
 	$result="auth_mode_error";
     }
@@ -8341,6 +8567,7 @@ sub sethost {
 	eq &Apache::lonnet::get_host_ip($hostid)) {
 	$currenthostid  =$hostid;
 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
+        &set_client_info();
 #	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {
 	&logthis("Requested host id $hostid not an alias of ".
@@ -8417,6 +8644,32 @@ sub get_prohibited {
     return %prohibited;
 }
 
+sub get_remote_hostable {
+    my ($dom) = @_;
+    my $result;
+    if ($clientintdom) {
+        $result = 1;
+        my $remsessconf = &get_usersession_config($dom,'remotesession');
+        if (ref($remsessconf) eq 'HASH') {
+            if (ref($remsessconf->{'remote'}) eq 'HASH') {
+                if (ref($remsessconf->{'remote'}->{'excludedomain'}) eq 'ARRAY') {
+                    if (grep(/^\Q$clientintdom\E$/,@{$remsessconf->{'remote'}->{'excludedomain'}})) {
+                        $result = 0;
+                    }
+                }
+                if (ref($remsessconf->{'remote'}->{'includedomain'}) eq 'ARRAY') {
+                    if (grep(/^\Q$clientintdom\E$/,@{$remsessconf->{'remote'}->{'includedomain'}})) {
+                        $result = 1;
+                    } else {
+                        $result = 0;
+                    }
+                }
+            }
+        }
+    }
+    return $result;
+}
+
 sub distro_and_arch {
     return $dist.':'.$arch;
 }
@@ -8742,7 +8995,6 @@ IO::File
 Apache::File
 POSIX
 Crypt::IDEA
-LWP::UserAgent()
 GDBM_File
 Authen::Krb4
 Authen::Krb5
@@ -8824,7 +9076,7 @@ is closed and the child exits.
 =item Red CRITICAL Can't get key file <error>        
 
 SSL key negotiation is being attempted but the call to
-lonssl::KeyFile  failed.  This usually means that the
+lonssl::KeyFile failed.  This usually means that the
 configuration file is not correctly defining or protecting
 the directories/files lonCertificateDirectory or
 lonnetPrivateKey