--- loncom/lond	2009/09/28 19:13:32	1.427
+++ loncom/lond	2016/05/08 20:48:35	1.521
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.427 2009/09/28 19:13:32 raeburn Exp $
+# $Id: lond,v 1.521 2016/05/08 20:48:35 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -15,6 +15,7 @@
 #
 # 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.
 #
@@ -33,6 +34,7 @@ use strict;
 use lib '/home/httpd/lib/perl/';
 use LONCAPA;
 use LONCAPA::Configuration;
+use LONCAPA::Lond;
 
 use IO::Socket;
 use IO::File;
@@ -42,7 +44,6 @@ use Crypt::IDEA;
 use LWP::UserAgent();
 use Digest::MD5 qw(md5_hex);
 use GDBM_File;
-use Authen::Krb4;
 use Authen::Krb5;
 use localauth;
 use localenroll;
@@ -53,13 +54,17 @@ use LONCAPA::lonlocal;
 use LONCAPA::lonssl;
 use Fcntl qw(:flock);
 use Apache::lonnet;
+use Mail::Send;
+use Crypt::Eksblowfish::Bcrypt;
+use Digest::SHA;
+use Encode;
 
 my $DEBUG = 0;		       # Non zero to enable debug log entries.
 
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.427 $'; #' stupid emacs
+my $VERSION='$Revision: 1.521 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -67,6 +72,9 @@ my $currentdomainid;
 my $client;
 my $clientip;			# IP address of client.
 my $clientname;			# LonCAPA name of client.
+my $clientversion;              # LonCAPA version running on client.
+my $clienthomedom;              # LonCAPA domain of homeID for client. 
+                                # primary library server. 
 
 my $server;
 
@@ -88,6 +96,8 @@ my %managers;			# Ip -> manager names
 
 my %perlvar;			# Will have the apache conf defined perl vars.
 
+my $dist;
+
 #
 #   The hash below is used for command dispatching, and is therefore keyed on the request keyword.
 #    Each element of the hash contains a reference to an array that contains:
@@ -123,32 +133,13 @@ my @passwderrors = ("ok",
 		   "pwchange_failure - lcpasswd Error filename is invalid");
 
 
-#  The array below are lcuseradd error strings.:
-
-my $lastadderror = 13;
-my @adderrors    = ("ok",
-		    "User ID mismatch, lcuseradd must run as user www",
-		    "lcuseradd Incorrect number of command line parameters must be 3",
-		    "lcuseradd Incorrect number of stdinput lines, must be 3",
-		    "lcuseradd Too many other simultaneous pwd changes in progress",
-		    "lcuseradd User does not exist",
-		    "lcuseradd Unable to make www member of users's group",
-		    "lcuseradd Unable to su to root",
-		    "lcuseradd Unable to set password",
-		    "lcuseradd Username has invalid characters",
-		    "lcuseradd Password has an invalid character",
-		    "lcuseradd User already exists",
-		    "lcuseradd Could not add user.",
-		    "lcuseradd Password mismatch");
-
-
 # This array are the errors from lcinstallfile:
 
 my @installerrors = ("ok",
 		     "Initial user id of client not that of www",
 		     "Usage error, not enough command line arguments",
-		     "Source file name does not exist",
-		     "Destination file name does not exist",
+		     "Source filename does not exist",
+		     "Destination filename does not exist",
 		     "Some file operation failed",
 		     "Invalid table filename."
 		     );
@@ -417,8 +408,11 @@ sub ReadManagerTable {
 
    my $tablename = $perlvar{'lonTabDir'}."/managers.tab";
    if (!open (MANAGERS, $tablename)) {
-      logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
-      return;
+       my $hostname = &Apache::lonnet::hostname($perlvar{'lonHostID'});
+       if (&Apache::lonnet::is_LC_dns($hostname)) {
+           &logthis('<font color="red">No manager table.  Nobody can manage!!</font>');
+       }
+       return;
    }
    while(my $host = <MANAGERS>) {
       chomp($host);
@@ -443,7 +437,7 @@ sub ReadManagerTable {
          }
       } else {
          logthis('<font color="green"> existing host'." $host</font>\n");
-         $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if clumemeber
+         $managers{&Apache::lonnet::get_host_ip($host)} = $host;  # Use info from cluster tab if cluster memeber
       }
    }
 }
@@ -505,7 +499,8 @@ sub AdjustHostContents {
     my $me        = $perlvar{'lonHostID'};
 
     foreach my $line (split(/\n/,$contents)) {
-	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/))) {
+	if(!(($line eq "") || ($line =~ /^ *\#/) || ($line =~ /^ *$/) ||
+             ($line =~ /^\s*\^/))) {
 	    chomp($line);
 	    my ($id,$domain,$role,$name,$ip,$maxcon,$idleto,$mincon)=split(/:/,$line);
 	    if ($id eq $me) {
@@ -593,11 +588,8 @@ sub InstallFile {
 #
 #   ConfigFileFromSelector: converts a configuration file selector
 #                 into a configuration file pathname.
-#                 It's probably no longer necessary to preserve
-#                 special handling of hosts or domain as those
-#                 files have been superceded by dns_hosts, dns_domain.
-#                 The default action is just to prepend the directory
-#                 and append .tab
+#                 Supports the following file selectors: 
+#                 hosts, domain, dns_hosts, dns_domain  
 #
 #
 #  Parameters:
@@ -610,15 +602,11 @@ sub ConfigFileFromSelector {
     my $tablefile;
 
     my $tabledir = $perlvar{'lonTabDir'}.'/';
-    if ($selector eq "hosts") {
-	$tablefile = $tabledir."hosts.tab";
-    } elsif ($selector eq "domain") {
-	$tablefile = $tabledir."domain.tab";
-    } else {
+    if (($selector eq "hosts") || ($selector eq "domain") || 
+        ($selector eq "dns_hosts") || ($selector eq "dns_domain")) {
 	$tablefile =  $tabledir.$selector.'.tab';
     }
     return $tablefile;
-
 }
 #
 #   PushFile:  Called to do an administrative push of a file.
@@ -636,7 +624,7 @@ sub ConfigFileFromSelector {
 #     String to send to client ("ok" or "refused" if bad file).
 #
 sub PushFile {
-    my $request = shift;    
+    my $request = shift;
     my ($command, $filename, $contents) = split(":", $request, 3);
     &Debug("PushFile");
     
@@ -644,6 +632,8 @@ sub PushFile {
     #  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). 
     # Construct the destination filename or reject the request.
     #
     # lonManage is supposed to ensure this, however this session could be
@@ -664,6 +654,44 @@ sub PushFile {
 
     if($filename eq "host") {
 	$contents = AdjustHostContents($contents);
+    } elsif ($filename eq 'dns_host' || $filename eq 'dns_domain') {
+        if ($contents eq '') {
+            &logthis('<font color="red"> Pushfile: unable to install '
+                    .$tablefile." - no data received from push. </font>");
+            return 'error: push had no data';
+        }
+        if (&Apache::lonnet::get_host_ip($clientname)) {
+            my $clienthost = &Apache::lonnet::hostname($clientname);
+            if ($managers{$clientip} eq $clientname) {
+                my $clientprotocol = $Apache::lonnet::protocol{$clientname};
+                $clientprotocol = 'http' if ($clientprotocol ne 'https');
+                my $url = '/adm/'.$filename;
+                $url =~ s{_}{/};
+                my $ua=new LWP::UserAgent;
+                $ua->timeout(60);
+                my $request=new HTTP::Request('GET',"$clientprotocol://$clienthost$url");
+                my $response=$ua->request($request);
+                if ($response->is_error()) {
+                    &logthis('<font color="red"> Pushfile: unable to install '
+                            .$tablefile." - error attempting to pull data. </font>");
+                    return 'error: pull failed';
+                } else {
+                    my $result = $response->content;
+                    chomp($result);
+                    unless ($result eq $contents) {
+                        &logthis('<font color="red"> Pushfile: unable to install '
+                                .$tablefile." - pushed data and pulled data differ. </font>");
+                        my $pushleng = length($contents);
+                        my $pullleng = length($result);
+                        if ($pushleng != $pullleng) {
+                            return "error: $pushleng vs $pullleng bytes";
+                        } else {
+                            return "error: mismatch push and pull";
+                        }
+                    }
+                }
+            }
+        }
     }
 
     #  Install the new file:
@@ -675,11 +703,31 @@ sub PushFile {
 	return "error:$!";
     } else {
 	&logthis('<font color="green"> Installed new '.$tablefile
-		 ."</font>");
-
+		 ." - transaction by: $clientname ($clientip)</font>");
+        my $adminmail = $perlvar{'lonAdmEMail'};
+        my $admindom = &Apache::lonnet::host_domain($perlvar{'lonHostID'});
+        if ($admindom ne '') {
+            my %domconfig =
+                &Apache::lonnet::get_dom('configuration',['contacts'],$admindom);
+            if (ref($domconfig{'contacts'}) eq 'HASH') {
+                if ($domconfig{'contacts'}{'adminemail'} ne '') {
+                    $adminmail = $domconfig{'contacts'}{'adminemail'};
+                }
+            }
+        }
+        if ($adminmail =~ /^[^\@]+\@[^\@]+$/) {
+            my $msg = new Mail::Send;
+            $msg->to($adminmail);
+            $msg->subject('LON-CAPA DNS update on '.$perlvar{'lonHostID'});
+            $msg->add('Content-type','text/plain; charset=UTF-8');
+            if (my $fh = $msg->open()) {
+                print $fh 'Update to '.$tablefile.' from Cluster Manager '.
+                          "$clientname ($clientip)\n";
+                $fh->close;
+            }
+        }
     }
 
-
     #  Indicate success:
  
     return "ok";
@@ -975,6 +1023,9 @@ sub read_profile {
 				 &GDBM_READER());
     if ($hashref) {
         my @queries=split(/\&/,$what);
+        if ($namespace eq 'roles') {
+            @queries = map { &unescape($_); } @queries; 
+        }
         my $qresult='';
 	
 	for (my $i=0;$i<=$#queries;$i++) {
@@ -1068,7 +1119,7 @@ sub pong_handler {
 #  Implicit Inputs:
 #      $currenthostid - Global variable that carries the name of the host
 #                       known as.
-#      $clientname    - Global variable that carries the name of the hsot we're connected to.
+#      $clientname    - Global variable that carries the name of the host we're connected to.
 #  Returns:
 #      1       - Ok to continue processing.
 #      0       - Program should exit.
@@ -1107,7 +1158,7 @@ sub establish_key_handler {
 #  Implicit Inputs:
 #      $currenthostid - Global variable that carries the name of the host
 #                       known as.
-#      $clientname    - Global variable that carries the name of the hsot we're connected to.
+#      $clientname    - Global variable that carries the name of the host we're connected to.
 #  Returns:
 #      1       - Ok to continue processing.
 #      0       - Program should exit.
@@ -1116,6 +1167,8 @@ sub establish_key_handler {
 sub load_handler {
     my ($cmd, $tail, $replyfd) = @_;
 
+
+
    # Get the load average from /proc/loadavg and calculate it as a percentage of
    # the allowed load limit as set by the perl global variable lonLoadLim
 
@@ -1144,7 +1197,7 @@ sub load_handler {
 #  Implicit Inputs:
 #      $currenthostid - Global variable that carries the name of the host
 #                       known as.
-#      $clientname    - Global variable that carries the name of the hsot we're connected to.
+#      $clientname    - Global variable that carries the name of the host we're connected to.
 #  Returns:
 #      1       - Ok to continue processing.
 #      0       - Program should exit
@@ -1613,6 +1666,80 @@ sub ls3_handler {
 }
 &register_handler("ls3", \&ls3_handler, 0, 1, 0);
 
+sub read_lonnet_global {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $requested = &Apache::lonnet::thaw_unescape($tail);
+    my $result;
+    my %packagevars = (
+                        spareid => \%Apache::lonnet::spareid,
+                        perlvar => \%Apache::lonnet::perlvar,
+                      );
+    my %limit_to = (
+                    perlvar => {
+                                 lonOtherAuthen => 1,
+                                 lonBalancer    => 1,
+                                 lonVersion     => 1,
+                                 lonSysEMail    => 1,
+                                 lonHostID      => 1,
+                                 lonRole        => 1,
+                                 lonDefDomain   => 1,
+                                 lonLoadLim     => 1,
+                                 lonUserLoadLim => 1,
+                               }
+                  );
+    if (ref($requested) eq 'HASH') {
+        foreach my $what (keys(%{$requested})) {
+            my $response;
+            my $items = {};
+            if (exists($packagevars{$what})) {
+                if (ref($limit_to{$what}) eq 'HASH') {
+                    foreach my $varname (keys(%{$packagevars{$what}})) {
+                        if ($limit_to{$what}{$varname}) {
+                            $items->{$varname} = $packagevars{$what}{$varname};
+                        }
+                    }
+                } else {
+                    $items = $packagevars{$what};
+                }
+                if ($what eq 'perlvar') {
+                    if (!exists($packagevars{$what}{'lonBalancer'})) {
+                        if ($dist =~ /^(centos|rhes|fedora|scientific)/) {
+                            my $othervarref=LONCAPA::Configuration::read_conf('httpd.conf');
+                            if (ref($othervarref) eq 'HASH') {
+                                $items->{'lonBalancer'} = $othervarref->{'lonBalancer'};
+                            }
+                        }
+                    }
+                }
+                $response = &Apache::lonnet::freeze_escape($items);
+            }
+            $result .= &escape($what).'='.$response.'&';
+        }
+    }
+    $result =~ s/\&$//;
+    &Reply($client,\$result,$userinput);
+    return 1;
+}
+&register_handler("readlonnetglobal", \&read_lonnet_global, 0, 1, 0);
+
+sub server_devalidatecache_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $items = &unescape($tail);
+    my @cached = split(/\&/,$items);
+    foreach my $key (@cached) {
+        if ($key =~ /:/) {
+            my ($name,$id) = map { &unescape($_); } split(/:/,$key);
+            &Apache::lonnet::devalidate_cache_new($name,$id);
+        }
+    }
+    my $result = 'ok';
+    &Reply($client,\$result,$userinput);
+    return 1;
+}
+&register_handler("devalidatecache", \&server_devalidatecache_handler, 0, 1, 0);
+
 sub server_timezone_handler {
     my ($cmd,$tail,$client) = @_;
     my $userinput = "$cmd:$tail";
@@ -1653,6 +1780,23 @@ sub server_loncaparev_handler {
 }
 &register_handler("serverloncaparev", \&server_loncaparev_handler, 0, 1, 0);
 
+sub server_homeID_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    &Reply($client,\$perlvar{'lonHostID'},$userinput);
+    return 1;
+}
+&register_handler("serverhomeID", \&server_homeID_handler, 0, 1, 0);
+
+sub server_distarch_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $reply = &distro_and_arch();
+    &Reply($client,\$reply,$userinput);
+    return 1;
+}
+&register_handler("serverdistarch", \&server_distarch_handler, 0, 1, 0);
+
 #   Process a reinit request.  Reinit requests that either
 #   lonc or lond be reinitialized so that an updated 
 #   host.tab or domain.tab can be processed.
@@ -1762,15 +1906,45 @@ sub authenticate_handler {
     #  upass   - User's password.
     #  checkdefauth - Pass to validate_user() to try authentication
     #                 with default auth type(s) if no user account.
+    #  clientcancheckhost - Passed by clients with functionality in lonauth.pm
+    #                       to check if session can be hosted.
     
-    my ($udom, $uname, $upass, $checkdefauth)=split(/:/,$tail);
+    my ($udom, $uname, $upass, $checkdefauth, $clientcancheckhost)=split(/:/,$tail);
     &Debug(" Authenticate domain = $udom, user = $uname, password = $upass,  checkdefauth = $checkdefauth");
     chomp($upass);
     $upass=&unescape($upass);
 
     my $pwdcorrect = &validate_user($udom,$uname,$upass,$checkdefauth);
     if($pwdcorrect) {
-	&Reply( $client, "authorized\n", $userinput);
+        my $canhost = 1;
+        unless ($clientcancheckhost) {
+            my $uprimary_id = &Apache::lonnet::domain($udom,'primary');
+            my $uint_dom = &Apache::lonnet::internet_dom($uprimary_id);
+            my @intdoms;
+            my $internet_names = &Apache::lonnet::get_internet_names($clientname);
+            if (ref($internet_names) eq 'ARRAY') {
+                @intdoms = @{$internet_names};
+            }
+            unless ($uint_dom ne '' && grep(/^\Q$uint_dom\E$/,@intdoms)) {
+                my ($remote,$hosted);
+                my $remotesession = &get_usersession_config($udom,'remotesession');
+                if (ref($remotesession) eq 'HASH') {
+                    $remote = $remotesession->{'remote'}
+                }
+                my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
+                if (ref($hostedsession) eq 'HASH') {
+                    $hosted = $hostedsession->{'hosted'};
+                }
+                $canhost = &Apache::lonnet::can_host_session($udom,$clientname,
+                                                             $clientversion,
+                                                             $remote,$hosted);
+            }
+        }
+        if ($canhost) {               
+            &Reply( $client, "authorized\n", $userinput);
+        } else {
+            &Reply( $client, "not_allowed_to_host\n", $userinput);
+        }
 	#
 	#  Bad credentials: Failed to authorize
 	#
@@ -1815,8 +1989,9 @@ sub change_password_handler {
     #  npass - New password.
     #  context - Context in which this was called 
     #            (preferences or reset_by_email).
+    #  lonhost - HostID of server where request originated 
    
-    my ($udom,$uname,$upass,$npass,$context)=split(/:/,$tail);
+    my ($udom,$uname,$upass,$npass,$context,$lonhost)=split(/:/,$tail);
 
     $upass=&unescape($upass);
     $npass=&unescape($npass);
@@ -1825,9 +2000,13 @@ sub change_password_handler {
     # First require that the user can be authenticated with their
     # old password unless context was 'reset_by_email':
     
-    my $validated;
+    my ($validated,$failure);
     if ($context eq 'reset_by_email') {
-        $validated = 1;
+        if ($lonhost eq '') {
+            $failure = 'invalid_client';
+        } else {
+            $validated = 1;
+        }
     } else {
         $validated = &validate_user($udom, $uname, $upass);
     }
@@ -1837,12 +2016,14 @@ sub change_password_handler {
 	my ($howpwd,$contentpwd)=split(/:/,$realpasswd);
 	if ($howpwd eq 'internal') {
 	    &Debug("internal auth");
-	    my $salt=time;
-	    $salt=substr($salt,6,2);
-	    my $ncpass=crypt($npass,$salt);
+            my $ncpass = &hash_passwd($udom,$npass);
 	    if(&rewrite_password_file($udom, $uname, "internal:$ncpass")) {
-		&logthis("Result of password change for "
-			 ."$uname: pwchange_success");
+		my $msg="Result of password change for $uname: pwchange_success";
+                if ($lonhost) {
+                    $msg .= " - request originated from: $lonhost";
+                }
+                &logthis($msg);
+                &update_passwd_history($uname,$udom,$howpwd,$context);
 		&Reply($client, "ok\n", $userinput);
 	    } else {
 		&logthis("Unable to open $uname passwd "               
@@ -1851,6 +2032,9 @@ sub change_password_handler {
 	    }
 	} elsif ($howpwd eq 'unix' && $context ne 'reset_by_email') {
 	    my $result = &change_unix_password($uname, $npass);
+            if ($result eq 'ok') {
+                &update_passwd_history($uname,$udom,$howpwd,$context);
+             }
 	    &logthis("Result of password change for $uname: ".
 		     $result);
 	    &Reply($client, \$result, $userinput);
@@ -1863,13 +2047,52 @@ sub change_password_handler {
 	}  
 	
     } else {
-	&Failure( $client, "non_authorized\n", $userinput);
+	if ($failure eq '') {
+	    $failure = 'non_authorized';
+	}
+	&Failure( $client, "$failure\n", $userinput);
     }
 
     return 1;
 }
 &register_handler("passwd", \&change_password_handler, 1, 1, 0);
 
+sub hash_passwd {
+    my ($domain,$plainpass,@rest) = @_;
+    my ($salt,$cost);
+    if (@rest) {
+        $cost = $rest[0];
+        # salt is first 22 characters, base-64 encoded by bcrypt
+        my $plainsalt = substr($rest[1],0,22);
+        $salt = Crypt::Eksblowfish::Bcrypt::de_base64($plainsalt);
+    } else {
+        my $defaultcost;
+        my %domconfig =
+            &Apache::lonnet::get_dom('configuration',['password'],$domain);
+        if (ref($domconfig{'password'}) eq 'HASH') {
+            $defaultcost = $domconfig{'password'}{'cost'};
+        }
+        if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
+            $cost = 10;
+        } else {
+            $cost = $defaultcost;
+        }
+        # Generate random 16-octet base64 salt
+        $salt = "";
+        $salt .= pack("C", int rand(256)) for 1..16;
+    }
+    my $hash = &Crypt::Eksblowfish::Bcrypt::bcrypt_hash({
+        key_nul => 1,
+        cost    => $cost,
+        salt    => $salt,
+    }, Digest::SHA::sha512(Encode::encode('UTF-8',$plainpass)));
+
+    my $result = join("!", "", "bcrypt", sprintf("%02d",$cost),
+                &Crypt::Eksblowfish::Bcrypt::en_base64($salt).
+                &Crypt::Eksblowfish::Bcrypt::en_base64($hash));
+    return $result;
+}
+
 #
 #   Create a new user.  User in this case means a lon-capa user.
 #   The user must either already exist in some authentication realm
@@ -1913,7 +2136,8 @@ sub add_user_handler {
 		    ."makeuser";
 	    }
 	    unless ($fperror) {
-		my $result=&make_passwd_file($uname, $umode,$npass, $passfilename);
+		my $result=&make_passwd_file($uname,$udom,$umode,$npass,
+                                             $passfilename,'makeuser');
 		&Reply($client,\$result, $userinput);     #BUGBUG - could be fail
 	    } else {
 		&Failure($client, \$fperror, $userinput);
@@ -1974,36 +2198,30 @@ sub change_authentication_handler {
 	my $passfilename = &password_path($udom, $uname);
 	if ($passfilename) {	# Not allowed to create a new user!!
 	    # If just changing the unix passwd. need to arrange to run
-	    # passwd since otherwise make_passwd_file will run
-	    # lcuseradd which fails if an account already exists
-	    # (to prevent an unscrupulous LONCAPA admin from stealing
-	    # an existing account by overwriting it as a LonCAPA account).
+	    # passwd since otherwise make_passwd_file will fail as 
+	    # creation of unix authenticated users is no longer supported
+            # except from the command line, when running make_domain_coordinator.pl
 
 	    if(($oldauth =~/^unix/) && ($umode eq "unix")) {
 		my $result = &change_unix_password($uname, $npass);
 		&logthis("Result of password change for $uname: ".$result);
 		if ($result eq "ok") {
+                    &update_passwd_history($uname,$udom,$umode,'changeuserauth'); 
 		    &Reply($client, \$result);
 		} else {
 		    &Failure($client, \$result);
 		}
 	    } else {
-		my $result=&make_passwd_file($uname, $umode,$npass,$passfilename);
+		my $result=&make_passwd_file($uname,$udom,$umode,$npass,
+                                             $passfilename,'changeuserauth');
 		#
 		#  If the current auth mode is internal, and the old auth mode was
 		#  unix, or krb*,  and the user is an author for this domain,
 		#  re-run manage_permissions for that role in order to be able
 		#  to take ownership of the construction space back to www:www
 		#
-		
-		
-		if( (($oldauth =~ /^unix/) && ($umode eq "internal")) ||
-		    (($oldauth =~ /^internal/) && ($umode eq "unix")) ) { 
-		    if(&is_author($udom, $uname)) {
-			&Debug(" Need to manage author permissions...");
-			&manage_permissions("/$udom/_au", $udom, $uname, "$umode:");
-		    }
-		}
+
+
 		&Reply($client, \$result, $userinput);
 	    }
 	       
@@ -2016,6 +2234,17 @@ sub change_authentication_handler {
 }
 &register_handler("changeuserauth", \&change_authentication_handler, 1,1, 0);
 
+sub update_passwd_history {
+    my ($uname,$udom,$umode,$context) = @_;
+    my $proname=&propath($udom,$uname);
+    my $now = time;
+    if (open(my $fh,">>$proname/passwd.log")) {
+        print $fh "$now:$umode:$context\n";
+        close($fh);
+    }
+    return;
+}
+
 #
 #   Determines if this is the home server for a user.  The home server
 #   for a user will have his/her lon-capa passwd file.  Therefore all we need
@@ -2050,16 +2279,10 @@ sub is_home_handler {
 &register_handler("home", \&is_home_handler, 0,1,0);
 
 #
-#   Process an update request for a resource?? I think what's going on here is
-#   that a resource has been modified that we hold a subscription to.
+#   Process an update request for a resource.
+#   A resource has been modified that we hold a subscription to.
 #   If the resource is not local, then we must update, or at least invalidate our
 #   cached copy of the resource. 
-#   FUTURE WORK:
-#      I need to look at this logic carefully.  My druthers would be to follow
-#      typical caching logic, and simple invalidate the cache, drop any subscription
-#      an let the next fetch start the ball rolling again... however that may
-#      actually be more difficult than it looks given the complex web of
-#      proxy servers.
 # Parameters:
 #    $cmd      - The command that got us here.
 #    $tail     - Tail of the command (remaining parameters).
@@ -2083,20 +2306,30 @@ sub update_resource_handler {
     my $ownership=ishome($fname);
     if ($ownership eq 'not_owner') {
 	if (-e $fname) {
+            # Delete preview file, if exists
+            unlink("$fname.tmp");
+            # Get usage stats
 	    my ($dev,$ino,$mode,$nlink,$uid,$gid,$rdev,$size,
 		$atime,$mtime,$ctime,$blksize,$blocks)=stat($fname);
 	    my $now=time;
 	    my $since=$now-$atime;
+            # If the file has not been used within lonExpire seconds,
+            # unsubscribe from it and delete local copy
 	    if ($since>$perlvar{'lonExpire'}) {
 		my $reply=&Apache::lonnet::reply("unsub:$fname","$clientname");
 		&devalidate_meta_cache($fname);
 		unlink("$fname");
 		unlink("$fname.meta");
 	    } else {
+            # Yes, this is in active use. Get a fresh copy. Since it might be in
+            # very active use and huge (like a movie), copy it to "in.transfer" filename first.
 		my $transname="$fname.in.transfer";
 		my $remoteurl=&Apache::lonnet::reply("sub:$fname","$clientname");
 		my $response;
-		alarm(120);
+# 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 $ua=new LWP::UserAgent;
 		    my $request=new HTTP::Request('GET',"$remoteurl");
@@ -2104,11 +2337,13 @@ sub update_resource_handler {
 		}
 		alarm(0);
 		if ($response->is_error()) {
+# FIXME: we should probably clean up here instead of just whine
 		    unlink($transname);
 		    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 $ua=new LWP::UserAgent;
@@ -2120,6 +2355,7 @@ sub update_resource_handler {
 			}
 			alarm(0);
 		    }
+                    # we successfully transfered, copy file over to real name
 		    rename($transname,$fname);
 		    &devalidate_meta_cache($fname);
 		}
@@ -2181,7 +2417,10 @@ sub fetch_user_file_handler {
 
 	my $destname=$udir.'/'.$ufile;
 	my $transname=$udir.'/'.$ufile.'.in.transit';
-	my $remoteurl='http://'.$clientip.'/userfiles/'.$fname;
+        my $clientprotocol=$Apache::lonnet::protocol{$clientname};
+        $clientprotocol = 'http' if ($clientprotocol ne 'https');
+	my $clienthost = &Apache::lonnet::hostname($clientname);
+	my $remoteurl=$clientprotocol.'://'.$clienthost.'/userfiles/'.$fname;
 	my $response;
 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
 	alarm(120);
@@ -2203,6 +2442,24 @@ sub fetch_user_file_handler {
 		unlink($transname);
 		&Failure($client, "failed\n", $userinput);
 	    } else {
+                if ($fname =~ /^default.+\.(page|sequence)$/) {
+                    my ($major,$minor) = split(/\./,$clientversion);
+                    if (($major < 2) || ($major == 2 && $minor < 11)) {
+                        my $now = time;
+                        &Apache::lonnet::do_cache_new('crschange',$udom.'_'.$uname,$now,600);
+                        my $key = &escape('internal.contentchange');
+                        my $what = "$key=$now";
+                        my $hashref = &tie_user_hash($udom,$uname,'environment',
+                                                     &GDBM_WRCREAT(),"P",$what);
+                        if ($hashref) {
+                            $hashref->{$key}=$now;
+                            if (!&untie_user_hash($hashref)) {
+                                &logthis("error: ".($!+0)." untie (GDBM) failed ".
+                                         "when updating internal.contentchange");
+                            }
+                        }
+                    }
+                }
 		&Reply($client, "ok\n", $userinput);
 	    }
 	}   
@@ -2239,11 +2496,20 @@ sub remove_user_file_handler {
 	    if (-e $file) {
 		#
 		#   If the file is a regular file unlink is fine...
-		#   However it's possible the client wants a dir.
-		#   removed, in which case rmdir is more approprate:
+		#   However it's possible the client wants a dir 
+		#   removed, in which case rmdir is more appropriate.
+		#   Note: rmdir will only remove an empty directory.
 		#
 	        if (-f $file){
 		    unlink($file);
+                    # for html files remove the associated .bak file 
+                    # which may have been created by the editor.
+                    if ($ufile =~ m{^((docs|supplemental)/(?:\d+|default)/\d+(?:|/.+)/)[^/]+\.x?html?$}i) {
+                        my $path = $1;
+                        if (-e $file.'.bak') {
+                            unlink($file.'.bak');
+                        }
+                    }
 		} elsif(-d $file) {
 		    rmdir($file);
 		}
@@ -2357,7 +2623,6 @@ sub user_has_session_handler {
 
     my ($udom, $uname) = map { &unescape($_) } (split(/:/, $tail));
     
-    &logthis("Looking for $udom $uname");
     opendir(DIR,$perlvar{'lonIDsDir'});
     my $filename;
     while ($filename=readdir(DIR)) {
@@ -2607,8 +2872,12 @@ sub newput_user_profile_entry {
     foreach my $pair (@pairs) {
 	my ($key,$value)=split(/=/,$pair);
 	if (exists($hashref->{$key})) {
-	    &Failure($client, "key_exists: ".$key."\n",$userinput);
-	    return 1;
+            if (!&untie_user_hash($hashref)) {
+                &logthis("error: ".($!+0)." untie (GDBM) failed ".
+                         "while attempting newput - early out as key exists");
+            }
+            &Failure($client, "key_exists: ".$key."\n",$userinput);
+            return 1;
 	}
     }
 
@@ -3010,6 +3279,17 @@ sub get_profile_keys {
 sub dump_profile_database {
     my ($cmd, $tail, $client) = @_;
 
+    my $res = LONCAPA::Lond::dump_profile_database($tail);
+
+    if ($res =~ /^error:/) {
+        Failure($client, \$res, "$cmd:$tail");
+    } else {
+        Reply($client, \$res, "$cmd:$tail");
+    }
+
+    return 1;  
+
+    #TODO remove 
     my $userinput = "$cmd:$tail";
    
     my ($udom,$uname,$namespace) = split(/:/,$tail);
@@ -3076,6 +3356,9 @@ sub dump_profile_database {
 #                                             that is matched against
 #                                             database keywords to do
 #                                             selective dumps.
+#                               range       - optional range of entries
+#                                             e.g., 10-20 would return the
+#                                             10th to 19th items, etc.  
 #   $client                   - Channel open on the client.
 # Returns:
 #    1    - Continue processing.
@@ -3085,56 +3368,12 @@ sub dump_profile_database {
 sub dump_with_regexp {
     my ($cmd, $tail, $client) = @_;
 
-
-    my $userinput = "$cmd:$tail";
-
-    my ($udom,$uname,$namespace,$regexp,$range)=split(/:/,$tail);
-    if (defined($regexp)) {
-	$regexp=&unescape($regexp);
-    } else {
-	$regexp='.';
-    }
-    my ($start,$end);
-    if (defined($range)) {
-	if ($range =~/^(\d+)\-(\d+)$/) {
-	    ($start,$end) = ($1,$2);
-	} elsif ($range =~/^(\d+)$/) {
-	    ($start,$end) = (0,$1);
-	} else {
-	    undef($range);
-	}
-    }
-    my $hashref = &tie_user_hash($udom, $uname, $namespace,
-				 &GDBM_READER());
-    if ($hashref) {
-        my $qresult='';
-	my $count=0;
-	while (my ($key,$value) = each(%$hashref)) {
-	    if ($regexp eq '.') {
-		$count++;
-		if (defined($range) && $count >= $end)   { last; }
-		if (defined($range) && $count <  $start) { next; }
-		$qresult.=$key.'='.$value.'&';
-	    } else {
-		my $unescapeKey = &unescape($key);
-		if (eval('$unescapeKey=~/$regexp/')) {
-		    $count++;
-		    if (defined($range) && $count >= $end)   { last; }
-		    if (defined($range) && $count <  $start) { next; }
-		    $qresult.="$key=$value&";
-		}
-	    }
-	}
-	if (&untie_user_hash($hashref)) {
-	    chop($qresult);
-	    &Reply($client, \$qresult, $userinput);
-	} else {
-	    &Failure( $client, "error: ".($!+0)." untie(GDBM) Failed ".
-		     "while attempting dump\n", $userinput);
-	}
+    my $res = LONCAPA::Lond::dump_with_regexp($tail, $clientversion);
+    
+    if ($res =~ /^error:/) {
+        Failure($client, \$res, "$cmd:$tail");
     } else {
-	&Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
-		"while attempting dump\n", $userinput);
+        Reply($client, \$res, "$cmd:$tail");
     }
 
     return 1;
@@ -3151,6 +3390,9 @@ sub dump_with_regexp {
 #                          namespace   - Name of the database being modified
 #                          rid         - Resource keyword to modify.
 #                          what        - new value associated with rid.
+#                          laststore   - (optional) version=timestamp
+#                                        for most recent transaction for rid
+#                                        in namespace, when cstore was called
 #
 #    $client             - Socket open on the client.
 #
@@ -3159,23 +3401,45 @@ sub dump_with_regexp {
 #      1 (keep on processing).
 #  Side-Effects:
 #    Writes to the client
+#    Successful storage will cause either 'ok', or, if $laststore was included
+#    in the tail of the request, and the version number for the last transaction
+#    is larger than the version in $laststore, delay:$numtrans , where $numtrans
+#    is the number of store evevnts recorded for rid in namespace since
+#    lonnet::store() was called by the client.
+#
 sub store_handler {
     my ($cmd, $tail, $client) = @_;
  
     my $userinput = "$cmd:$tail";
-
-    my ($udom,$uname,$namespace,$rid,$what) =split(/:/,$tail);
+    chomp($tail);
+    my ($udom,$uname,$namespace,$rid,$what,$laststore) =split(/:/,$tail);
     if ($namespace ne 'roles') {
 
-	chomp($what);
 	my @pairs=split(/\&/,$what);
 	my $hashref  = &tie_user_hash($udom, $uname, $namespace,
 				       &GDBM_WRCREAT(), "S",
 				       "$rid:$what");
 	if ($hashref) {
 	    my $now = time;
-	    my @previouskeys=split(/&/,$hashref->{"keys:$rid"});
-	    my $key;
+            my $numtrans;
+            if ($laststore) {
+                my ($previousversion,$previoustime) = split(/\=/,$laststore);
+                my ($lastversion,$lasttime) = (0,0);
+                $lastversion = $hashref->{"version:$rid"};
+                if ($lastversion) {
+                    $lasttime = $hashref->{"$lastversion:$rid:timestamp"};
+                }
+                if (($previousversion) && ($previousversion !~ /\D/)) {
+                    if (($lastversion > $previousversion) && ($lasttime >= $previoustime)) {
+                        $numtrans = $lastversion - $previousversion;
+                    }
+                } elsif ($lastversion) {
+                    $numtrans = $lastversion;
+                }
+                if ($numtrans) {
+                    $numtrans =~ s/D//g;
+                }
+            }
 	    $hashref->{"version:$rid"}++;
 	    my $version=$hashref->{"version:$rid"};
 	    my $allkeys=''; 
@@ -3188,7 +3452,11 @@ sub store_handler {
 	    $allkeys.='timestamp';
 	    $hashref->{"$version:keys:$rid"}=$allkeys;
 	    if (&untie_user_hash($hashref)) {
-		&Reply($client, "ok\n", $userinput);
+                my $msg = 'ok';
+                if ($numtrans) {
+                    $msg = 'delay:'.$numtrans;
+                }
+		&Reply($client, "$msg\n", $userinput);
 	    } else {
 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
 			"while attempting store\n", $userinput);
@@ -3703,6 +3971,11 @@ sub put_course_id_hash_handler {
 #                 createdafter - include courses for which creation date followed this date.
 #                 creationcontext - include courses created in specified context 
 #
+#                 domcloner - flag to indicate if user can create CCs in course's domain.
+#                             If so, ability to clone course is automatic.
+#                 hasuniquecode - filter by courses for which a six character unique code has 
+#                                 been set.
+#
 #     $client  - The socket open on the client.
 # Returns:
 #    1     - Continue processing.
@@ -3710,12 +3983,23 @@ sub put_course_id_hash_handler {
 #   a reply is written to $client.
 sub dump_course_id_handler {
     my ($cmd, $tail, $client) = @_;
+
+    my $res = LONCAPA::Lond::dump_course_id_handler($tail);
+    if ($res =~ /^error:/) {
+        Failure($client, \$res, "$cmd:$tail");
+    } else {
+        Reply($client, \$res, "$cmd:$tail");
+    }
+
+    return 1;  
+
+    #TODO remove
     my $userinput = "$cmd:$tail";
 
     my ($udom,$since,$description,$instcodefilter,$ownerfilter,$coursefilter,
         $typefilter,$regexp_ok,$rtn_as_hash,$selfenrollonly,$catfilter,$showhidden,
         $caller,$cloner,$cc_clone_list,$cloneonly,$createdbefore,$createdafter,
-        $creationcontext) =split(/:/,$tail);
+        $creationcontext,$domcloner,$hasuniquecode) =split(/:/,$tail);
     my $now = time;
     my ($cloneruname,$clonerudom,%cc_clone);
     if (defined($description)) {
@@ -3773,24 +4057,26 @@ sub dump_course_id_handler {
             $cc_clone{$clonedom.'_'.$clonenum} = 1;
         } 
     }
-    if (defined($createdbefore)) {
+    if ($createdbefore ne '') {
         $createdbefore = &unescape($createdbefore);
     } else {
        $createdbefore = 0;
     }
-    if (defined($createdafter)) {
+    if ($createdafter ne '') {
         $createdafter = &unescape($createdafter);
     } else {
         $createdafter = 0;
     }
-    if (defined($creationcontext)) {
+    if ($creationcontext ne '') {
         $creationcontext = &unescape($creationcontext);
     } else {
         $creationcontext = '.';
     }
-    
+    unless ($hasuniquecode) {
+        $hasuniquecode = '.';
+    }
     my $unpack = 1;
-    if ($description eq '.' && $instcodefilter eq '.' && $coursefilter eq '.' && 
+    if ($description eq '.' && $instcodefilter eq '.' && $ownerfilter eq '.' && 
         $typefilter eq '.') {
         $unpack = 0;
     }
@@ -3815,8 +4101,13 @@ sub dump_course_id_handler {
             my ($canclone,$valchange);
             my $items = &Apache::lonnet::thaw_unescape($value);
             if (ref($items) eq 'HASH') {
+                if ($hashref->{$lasttime_key} eq '') {
+                    next if ($since > 1);
+                }
                 $is_hash =  1;
-                if (defined($clonerudom)) {
+                if ($domcloner) {
+                    $canclone = 1;
+                } elsif (defined($clonerudom)) {
                     if ($items->{'cloners'}) {
                         my @cloneable = split(',',$items->{'cloners'});
                         if (@cloneable) {
@@ -3844,6 +4135,19 @@ sub dump_course_id_handler {
                             $items->{'cloners'} = $cloneruname.':'.$clonerudom;
                             $valchange = 1;
                         }
+                        unless ($canclone) {
+                            if ($items->{'owner'} =~ /:/) {
+                                if ($items->{'owner'} eq $cloner) {
+                                    $canclone = 1;
+                                }
+                            } elsif ($cloner eq $items->{'owner'}.':'.$udom) {
+                                $canclone = 1;
+                            }
+                            if ($canclone) {
+                                $items->{'cloners'} = $cloneruname.':'.$clonerudom;
+                                $valchange = 1;
+                            }
+                        }
                     }
                 }
                 if ($unpack || !$rtn_as_hash) {
@@ -3859,6 +4163,9 @@ sub dump_course_id_handler {
                 $selfenroll_end = $items->{'selfenroll_end_date'};
                 $created = $items->{'created'};
                 $context = $items->{'context'};
+                if ($hasuniquecode ne '.') {
+                    next unless ($items->{'uniquecode'});
+                }
                 if ($selfenrollonly) {
                     next if (!$selfenroll_types);
                     if (($selfenroll_end > 0) && ($selfenroll_end <= $now)) {
@@ -4044,6 +4351,53 @@ sub dump_course_id_handler {
 }
 &register_handler("courseiddump", \&dump_course_id_handler, 0, 1, 0);
 
+sub course_lastaccess_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($cdom,$cnum) = split(':',$tail); 
+    my (%lastaccess,$qresult);
+    my $hashref = &tie_domain_hash($cdom, "nohist_courseids", &GDBM_WRCREAT());
+    if ($hashref) {
+        while (my ($key,$value) = each(%$hashref)) {
+            my ($unesc_key,$lasttime);
+            $unesc_key = &unescape($key);
+            if ($cnum) {
+                next unless ($unesc_key =~ /\Q$cdom\E_\Q$cnum\E$/);
+            }
+            if ($unesc_key =~ /^lasttime:($LONCAPA::match_domain\_$LONCAPA::match_courseid)/) {
+                $lastaccess{$1} = $value;
+            } else {
+                my $items = &Apache::lonnet::thaw_unescape($value);
+                if (ref($items) eq 'HASH') {
+                    unless ($lastaccess{$unesc_key}) {
+                        $lastaccess{$unesc_key} = '';
+                    }
+                } else {
+                    my @courseitems = split(':',$value);
+                    $lastaccess{$unesc_key} = pop(@courseitems);
+                }
+            }
+        }
+        foreach my $cid (sort(keys(%lastaccess))) {
+            $qresult.=&escape($cid).'='.$lastaccess{$cid}.'&'; 
+        }
+        if (&untie_domain_hash($hashref)) {
+            if ($qresult) {
+                chop($qresult);
+            }
+            &Reply($client, \$qresult, $userinput);
+        } else {
+            &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                    "while attempting lastacourseaccess\n", $userinput);
+        }
+    } else {
+        &Failure($client, "error: ".($!+0)." tie(GDBM) Failed ".
+                "while attempting lastcourseaccess\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("courselastaccess",\&course_lastaccess_handler, 0, 1, 0);
+
 #
 # Puts an unencrypted entry in a namespace db file at the domain level 
 #
@@ -4087,6 +4441,122 @@ sub put_domain_handler {
 }
 &register_handler("putdom", \&put_domain_handler, 0, 1, 0);
 
+# Updates one or more entries in clickers.db file at the domain level
+#
+# Parameters:
+#    $cmd      - The command that got us here.
+#    $tail     - Tail of the command (remaining parameters).
+#                In this case a colon separated list containing:
+#                (a) the domain for which we are updating the entries,
+#                (b) the action required -- add or del -- and
+#                (c) a &-separated list of entries to add or delete.
+#    $client   - File descriptor connected to client.
+# Returns
+#     1        - Continue processing.
+#     0        - Requested to exit, caller should shut down.
+#  Side effects:
+#     reply is written to $client.
+#
+
+
+sub update_clickers {
+    my ($cmd, $tail, $client)  = @_;
+
+    my $userinput = "$cmd:$tail";
+    my ($udom,$action,$what) =split(/:/,$tail,3);
+    chomp($what);
+
+    my $hashref = &tie_domain_hash($udom, "clickers", &GDBM_WRCREAT(),
+                                 "U","$action:$what");
+
+    if (!$hashref) {
+        &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                  "while attempting updateclickers\n", $userinput);
+        return 1;
+    }
+
+    my @pairs=split(/\&/,$what);
+    foreach my $pair (@pairs) {
+        my ($key,$value)=split(/=/,$pair);
+        if ($action eq 'add') {
+            if (exists($hashref->{$key})) {
+                my @newvals = split(/,/,&unescape($value));
+                my @currvals = split(/,/,&unescape($hashref->{$key}));
+                my @merged = sort(keys(%{{map { $_ => 1 } (@newvals,@currvals)}}));
+                $hashref->{$key}=&escape(join(',',@merged));
+            } else {
+                $hashref->{$key}=$value;
+            }
+        } elsif ($action eq 'del') {
+            if (exists($hashref->{$key})) {
+                my %current;
+                map { $current{$_} = 1; } split(/,/,&unescape($hashref->{$key}));
+                map { delete($current{$_}); } split(/,/,&unescape($value));
+                if (keys(%current)) {
+                    $hashref->{$key}=&escape(join(',',sort(keys(%current))));
+                } else {
+                    delete($hashref->{$key});
+                }
+            }
+        }
+    }
+    if (&untie_user_hash($hashref)) {
+        &Reply( $client, "ok\n", $userinput);
+    } else {
+        &Failure($client, "error: ".($!+0)." untie(GDBM) failed ".
+                 "while attempting put\n",
+                 $userinput);
+    }
+    return 1;
+}
+&register_handler("updateclickers", \&update_clickers, 0, 1, 0);
+
+
+# Deletes one or more entries in a namespace db file at the domain level
+#
+# Parameters:
+#    $cmd      - The command that got us here.
+#    $tail     - Tail of the command (remaining parameters).
+#                In this case a colon separated list containing:
+#                (a) the domain for which we are deleting the entries,
+#                (b) &-separated list of keys to delete.  
+#    $client   - File descriptor connected to client.
+# Returns
+#     1        - Continue processing.
+#     0        - Requested to exit, caller should shut down.
+#  Side effects:
+#     reply is written to $client.
+#
+
+sub del_domain_handler {
+    my ($cmd,$tail,$client) = @_;
+
+    my $userinput = "$cmd:$tail";
+
+    my ($udom,$namespace,$what)=split(/:/,$tail,3);
+    chomp($what);
+    my $hashref = &tie_domain_hash($udom,$namespace,&GDBM_WRCREAT(),
+                                   "D", $what);
+    if ($hashref) {
+        my @keys=split(/\&/,$what);
+        foreach my $key (@keys) {
+            delete($hashref->{$key});
+        }
+        if (&untie_user_hash($hashref)) {
+            &Reply($client, "ok\n", $userinput);
+        } else {
+            &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                    "while attempting deldom\n", $userinput);
+        }
+    } else {
+        &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting deldom\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("deldom", \&del_domain_handler, 0, 1, 0);
+
+
 # Unencrypted get from the namespace database file at the domain level.
 # This function retrieves a keyed item from a specific named database in the
 # domain directory.
@@ -4109,6 +4579,7 @@ sub put_domain_handler {
 sub get_domain_handler {
     my ($cmd, $tail, $client) = @_;
 
+
     my $userinput = "$client:$tail";
 
     my ($udom,$namespace,$what)=split(/:/,$tail,3);
@@ -4233,6 +4704,49 @@ sub get_id_handler {
 }
 &register_handler("idget", \&get_id_handler, 0, 1, 0);
 
+#   Deletes one or more ids in a domain's id database.
+#
+#   Parameters:
+#       $cmd                  - Command keyword (iddel).
+#       $tail                 - Command tail.  In this case a colon
+#                               separated list containing:
+#                               The domain for which we are deleting the id(s).
+#                               &-separated list of id(s) to delete.
+#       $client               - File open on client socket.
+# Returns:
+#     1   - Continue processing
+#     0   - Exit server.
+#     
+#
+
+sub del_id_handler {
+    my ($cmd,$tail,$client) = @_;
+
+    my $userinput = "$cmd:$tail";
+
+    my ($udom,$what)=split(/:/,$tail);
+    chomp($what);
+    my $hashref = &tie_domain_hash($udom, "ids", &GDBM_WRCREAT(),
+                                   "D", $what);
+    if ($hashref) {
+        my @keys=split(/\&/,$what);
+        foreach my $key (@keys) {
+            delete($hashref->{$key});
+        }
+        if (&untie_user_hash($hashref)) {
+            &Reply($client, "ok\n", $userinput);
+        } else {
+            &Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
+                    "while attempting iddel\n", $userinput);
+        }
+    } else {
+        &Failure( $client, "error: ".($!+0)." tie(GDBM) Failed ".
+                 "while attempting iddel\n", $userinput);
+    }
+    return 1;
+}
+&register_handler("iddel", \&del_id_handler, 0, 1, 0);
+
 #
 # Puts broadcast e-mail sent by Domain Coordinator in nohist_dcmail database 
 #
@@ -4253,7 +4767,8 @@ sub get_id_handler {
 sub put_dcmail_handler {
     my ($cmd,$tail,$client) = @_;
     my $userinput = "$cmd:$tail";
-                                                                                
+
+
     my ($udom,$what)=split(/:/,$tail);
     chomp($what);
     my $hashref = &tie_domain_hash($udom, "nohist_dcmail", &GDBM_WRCREAT());
@@ -4517,7 +5032,7 @@ sub tmp_put_handler {
     }
     my ($id,$store);
     $tmpsnum++;
-    if ($context eq 'resetpw') {
+    if (($context eq 'resetpw') || ($context eq 'createaccount')) {
         $id = &md5_hex(&md5_hex(time.{}.rand().$$));
     } else {
         $id = $$.'_'.$clientip.'_'.$tmpsnum;
@@ -4780,9 +5295,10 @@ sub validate_instcode_handler {
     my ($dom,$instcode,$owner) = split(/:/, $tail);
     $instcode = &unescape($instcode);
     $owner = &unescape($owner);
-    my ($outcome,$description) = 
+    my ($outcome,$description,$credits) = 
         &localenroll::validate_instcode($dom,$instcode,$owner);
-    my $result = &escape($outcome).'&'.&escape($description);
+    my $result = &escape($outcome).'&'.&escape($description).'&'.
+                 &escape($credits);
     &Reply($client, \$result, $userinput);
 
     return 1;
@@ -4835,10 +5351,11 @@ sub get_sections_handler {
 sub validate_course_owner_handler {
     my ($cmd, $tail, $client)  = @_;
     my $userinput = "$cmd:$tail";
-    my ($inst_course_id, $owner, $cdom) = split(/:/, $tail);
-
+    my ($inst_course_id, $owner, $cdom, $coowners) = split(/:/, $tail);
+    
     $owner = &unescape($owner);
-    my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom);
+    $coowners = &unescape($coowners);
+    my $outcome = &localenroll::new_course($inst_course_id,$owner,$cdom,$coowners);
     &Reply($client, \$outcome, $userinput);
 
 
@@ -4965,7 +5482,10 @@ sub retrieve_auto_file_handler {
     my ($filename)   = split(/:/, $tail);
 
     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
-    if ( (-e $source) && ($filename ne '') ) {
+
+    if ($filename =~m{/\.\./}) {
+        &Failure($client, "refused\n", $userinput);
+    } elsif ( (-e $source) && ($filename ne '') ) {
 	my $reply = '';
 	if (open(my $fh,$source)) {
 	    while (<$fh>) {
@@ -4997,7 +5517,7 @@ sub crsreq_checks_handler {
     my $userinput = "$cmd:$tail";
     my $dom = $tail;
     my $result;
-    my @reqtypes = ('official','unofficial','community');
+    my @reqtypes = ('official','unofficial','community','textbook','placement');
     eval {
         local($SIG{__DIE__})='DEFAULT';
         my %validations;
@@ -5024,19 +5544,20 @@ sub crsreq_checks_handler {
 sub validate_crsreq_handler {
     my ($cmd, $tail, $client) = @_;
     my $userinput = "$cmd:$tail";
-    my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist) = split(/:/, $tail);
+    my ($dom,$owner,$crstype,$inststatuslist,$instcode,$instseclist,$customdata) = split(/:/, $tail);
     $instcode = &unescape($instcode);
     $owner = &unescape($owner);
     $crstype = &unescape($crstype);
     $inststatuslist = &unescape($inststatuslist);
     $instcode = &unescape($instcode);
     $instseclist = &unescape($instseclist);
+    my $custominfo = &Apache::lonnet::thaw_unescape($customdata);
     my $outcome;
     eval {
         local($SIG{__DIE__})='DEFAULT';
         $outcome = &localenroll::validate_crsreq($dom,$owner,$crstype,
                                                  $inststatuslist,$instcode,
-                                                 $instseclist);
+                                                 $instseclist,$custominfo);
     };
     if (!$@) {
         &Reply($client, \$outcome, $userinput);
@@ -5047,6 +5568,53 @@ sub validate_crsreq_handler {
 }
 &register_handler("autocrsreqvalidation", \&validate_crsreq_handler, 0, 1, 0);
 
+sub crsreq_update_handler {
+    my ($cmd, $tail, $client) = @_;
+    my $userinput = "$cmd:$tail";
+    my ($cdom,$cnum,$crstype,$action,$ownername,$ownerdomain,$fullname,$title,$code,
+        $accessstart,$accessend,$infohashref) =
+        split(/:/, $tail);
+    $crstype = &unescape($crstype);
+    $action = &unescape($action);
+    $ownername = &unescape($ownername);
+    $ownerdomain = &unescape($ownerdomain);
+    $fullname = &unescape($fullname);
+    $title = &unescape($title);
+    $code = &unescape($code);
+    $accessstart = &unescape($accessstart);
+    $accessend = &unescape($accessend);
+    my $incoming = &Apache::lonnet::thaw_unescape($infohashref);
+    my ($result,$outcome);
+    eval {
+        local($SIG{__DIE__})='DEFAULT';
+        my %rtnhash;
+        $outcome = &localenroll::crsreq_updates($cdom,$cnum,$crstype,$action,
+                                                $ownername,$ownerdomain,$fullname,
+                                                $title,$code,$accessstart,$accessend,
+                                                $incoming,\%rtnhash);
+        if ($outcome eq 'ok') {
+            my @posskeys = qw(createdweb createdmsg createdcustomized createdactions queuedweb queuedmsg formitems reviewweb validationjs onload javascript);
+            foreach my $key (keys(%rtnhash)) {
+                if (grep(/^\Q$key\E/,@posskeys)) {
+                    $result .= &escape($key).'='.&Apache::lonnet::freeze_escape($rtnhash{$key}).'&';
+                }
+            }
+            $result =~ s/\&$//;
+        }
+    };
+    if (!$@) {
+        if ($outcome eq 'ok') {
+            &Reply($client, \$result, $userinput);
+        } else {
+            &Reply($client, "format_error\n", $userinput);
+        }
+    } else {
+        &Failure($client,"unknown_cmd\n",$userinput);
+    }
+    return 1;
+}
+&register_handler("autocrsrequpdate", \&crsreq_update_handler, 0, 1, 0);
+
 #
 #   Read and retrieve institutional code format (for support form).
 # Formal Parameters:
@@ -5754,18 +6322,6 @@ sub lcpasswdstrerror {
     }
 }
 
-#
-# Convert an error return code from lcuseradd to a string value:
-#
-sub lcuseraddstrerror {
-    my $ErrorCode = shift;
-    if(($ErrorCode < 0) || ($ErrorCode > $lastadderror)) {
-	return "lcuseradd - Unrecognized error code: ".$ErrorCode;
-    } else {
-	return $adderrors[$ErrorCode];
-    }
-}
-
 # grabs exception and records it to log before exiting
 sub catchexception {
     my ($error)=@_;
@@ -5826,7 +6382,7 @@ if (-e $pidfile) {
 $server = IO::Socket::INET->new(LocalPort => $perlvar{'londPort'},
                                 Type      => SOCK_STREAM,
                                 Proto     => 'tcp',
-                                Reuse     => 1,
+                                ReuseAddr     => 1,
                                 Listen    => 10 )
   or die "making socket: $@\n";
 
@@ -5889,9 +6445,13 @@ sub HUPSMAN {                      # sig
 #  a setuid perl script that can be root for us to do this job.
 #
 sub ReloadApache {
-    my $execdir = $perlvar{'lonDaemons'};
-    my $script  = $execdir."/apachereload";
-    system($script);
+# --------------------------- Handle case of another apachereload process (locking)
+    if (&LONCAPA::try_to_lock('/tmp/lock_apachereload')) {
+        my $execdir = $perlvar{'lonDaemons'};
+        my $script  = $execdir."/apachereload";
+        system($script);
+        unlink('/tmp/lock_apachereload'); #  Remove the lock file.
+    }
 }
 
 #
@@ -6002,6 +6562,9 @@ sub Debug {
 #     reply   - Text to send to client.
 #     request - Original request from client.
 #
+#NOTE $reply must be terminated by exactly *one* \n. If $reply is a reference
+#this is done automatically ($$reply must not contain any \n in this case). 
+#If $reply is a string the caller has to ensure this.
 sub Reply {
     my ($fd, $reply, $request) = @_;
     if (ref($reply)) {
@@ -6064,7 +6627,7 @@ sub logstatus {
 sub initnewstatus {
     my $docdir=$perlvar{'lonDocRoot'};
     my $fh=IO::File->new(">$docdir/lon-status/londstatus.txt");
-    my $now=time;
+    my $now=time();
     my $local=localtime($now);
     print $fh "LOND status $local - parent $$\n\n";
     opendir(DIR,"$docdir/lon-status/londchld");
@@ -6153,8 +6716,16 @@ $SIG{USR2} = \&UpdateHosts;
 
 #  Read the host hashes:
 &Apache::lonnet::load_hosts_tab();
+my %iphost = &Apache::lonnet::get_iphost(1);
 
-my $dist=`$perlvar{'lonDaemons'}/distprobe`;
+$dist=`$perlvar{'lonDaemons'}/distprobe`;
+
+my $arch = `uname -i`;
+chomp($arch);
+if ($arch eq 'unknown') {
+    $arch = `uname -m`;
+    chomp($arch);
+}
 
 # --------------------------------------------------------------
 #   Accept connections.  When a connection comes in, it is validated
@@ -6213,6 +6784,7 @@ sub make_new_child {
             or die "Can't unblock SIGINT for fork: $!\n";
         $children{$pid} = $clientip;
         &status('Started child '.$pid);
+	close($client);
         return;
     } else {
         # Child can *not* return from this subroutine.
@@ -6221,6 +6793,13 @@ sub make_new_child {
                                 #don't get intercepted
         $SIG{USR1}= \&logstatus;
         $SIG{ALRM}= \&timeout;
+	#
+	# Block sigpipe as it gets thrownon socket disconnect and we want to 
+	# deal with that as a read faiure instead.
+	#
+	my $blockset = POSIX::SigSet->new(SIGPIPE);
+	sigprocmask(SIG_BLOCK, $blockset);
+
         $lastlog='Forked ';
         $status='Forked';
 
@@ -6231,8 +6810,26 @@ sub make_new_child {
 #        my $tmpsnum=0;            # Now global
 #---------------------------------------------------- kerberos 5 initialization
         &Authen::Krb5::init_context();
-	unless (($dist eq 'fedora5') || ($dist eq 'fedora4') ||  
-		($dist eq 'fedora6') || ($dist eq 'suse9.3')) {
+
+        my $no_ets;
+        if ($dist =~ /^(?:centos|rhes|scientific)(\d+)$/) {
+            if ($1 >= 7) {
+                $no_ets = 1;
+            }
+        } elsif ($dist =~ /^suse(\d+\.\d+)$/) {
+            if (($1 eq '9.3') || ($1 >= 12.2)) {
+                $no_ets = 1; 
+            }
+        } elsif ($dist =~ /^sles(\d+)$/) {
+            if ($1 > 11) {
+                $no_ets = 1;
+            }
+        } elsif ($dist =~ /^fedora(\d+)$/) {
+            if ($1 < 7) {
+                $no_ets = 1;
+            }
+        }
+        unless ($no_ets) {
 	    &Authen::Krb5::init_ets();
 	}
 
@@ -6249,7 +6846,7 @@ sub make_new_child {
 	&ReadManagerTable();
 	my $clientrec=defined(&Apache::lonnet::get_hosts_from_ip($outsideip));
 	my $ismanager=($managers{$outsideip}    ne undef);
-	$clientname  = "[unknonwn]";
+	$clientname  = "[unknown]";
 	if($clientrec) {	# Establish client type.
 	    $ConnectionType = "client";
 	    $clientname = (&Apache::lonnet::get_hosts_from_ip($outsideip))[-1];
@@ -6277,7 +6874,13 @@ sub make_new_child {
 		#
 		#  If the remote is attempting a local init... give that a try:
 		#
-		my ($i, $inittype) = split(/:/, $remotereq);
+		(my $i, my $inittype, $clientversion) = split(/:/, $remotereq);
+        # For LON-CAPA 2.9, the  client session will have sent its LON-CAPA
+        # version when initiating the connection. For LON-CAPA 2.8 and older,
+        # the version is retrieved from the global %loncaparevs in lonnet.pm.            
+        # $clientversion contains path to keyfile if $inittype eq 'local'
+        # it's overridden below in this case
+        $clientversion ||= $Apache::lonnet::loncaparevs{$clientname};
 
 		# If the connection type is ssl, but I didn't get my
 		# certificate files yet, then I'll drop  back to 
@@ -6297,6 +6900,7 @@ sub make_new_child {
 		}
 
 		if($inittype eq "local") {
+                    $clientversion = $perlvar{'lonVersion'};
 		    my $key = LocalConnection($client, $remotereq);
 		    if($key) {
 			Debug("Got local key $key");
@@ -6304,7 +6908,7 @@ sub make_new_child {
 			my $cipherkey = pack("H32", $key);
 			$cipher       = new IDEA($cipherkey);
 			print $client "ok:local\n";
-			&logthis('<font color="green"'
+			&logthis('<font color="green">'
 				 . "Successful local authentication </font>");
 			$keymode = "local"
 		    } else {
@@ -6368,6 +6972,9 @@ sub make_new_child {
 # ------------------------------------------------------------ Process requests
 	    my $keep_going = 1;
 	    my $user_input;
+            my $clienthost = &Apache::lonnet::hostname($clientname);
+            my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
+            $clienthomedom = &Apache::lonnet::host_domain($clientserverhomeID);
 	    while(($user_input = get_request) && $keep_going) {
 		alarm(120);
 		Debug("Main: Got $user_input\n");
@@ -6417,22 +7024,29 @@ sub is_author {
 
     #  Author role should show up as a key /domain/_au
 
-    my $key    = "/$domain/_au";
     my $value;
-    if (defined($hashref)) {
-	$value = $hashref->{$key};
-    }
+    if ($hashref) {
 
-    if(defined($value)) {
-	&Debug("$user @ $domain is an author");
+	my $key    = "/$domain/_au";
+	if (defined($hashref)) {
+	    $value = $hashref->{$key};
+	    if(!untie_user_hash($hashref)) {
+		return 'error: ' .  ($!+0)." untie (GDBM) Failed";
+	    }
+	}
+	
+	if(defined($value)) {
+	    &Debug("$user @ $domain is an author");
+	}
+    } else {
+	return 'error: '.($!+0)." tie (GDBM) Failed";
     }
 
     return defined($value);
 }
 #
 #   Checks to see if the input roleput request was to set
-# an author role.  If so, invokes the lchtmldir script to set
-# up a correct public_html 
+# an author role.  If so, creates construction space 
 # Parameters:
 #    request   - The request sent to the rolesput subchunk.
 #                We're looking for  /domain/_au
@@ -6442,16 +7056,15 @@ sub is_author {
 #
 sub manage_permissions {
     my ($request, $domain, $user, $authtype) = @_;
-
-    &Debug("manage_permissions: $request $domain $user $authtype");
-
     # See if the request is of the form /$domain/_au
     if($request =~ /^(\/\Q$domain\E\/_au)$/) { # It's an author rolesput...
-	my $execdir = $perlvar{'lonDaemons'};
-	my $userhome= "/home/$user" ;
-	&logthis("system $execdir/lchtmldir $userhome $user $authtype");
-	&Debug("Setting homedir permissions for $userhome");
-	system("$execdir/lchtmldir $userhome $user $authtype");
+        my $path=$perlvar{'lonDocRoot'}."/priv/$domain";
+        unless (-e $path) {        
+           mkdir($path);
+        }
+        unless (-e $path.'/'.$user) {
+           mkdir($path.'/'.$user);
+        }
     }
 }
 
@@ -6526,9 +7139,7 @@ sub rewrite_password_file {
 
 #     Returns the authorization type or nouser if there is no such user.
 #
-sub get_auth_type 
-{
-
+sub get_auth_type {
     my ($domain, $user)  = @_;
 
     Debug("get_auth_type( $domain, $user ) \n");
@@ -6603,7 +7214,18 @@ sub validate_user {
     } 
     if ($howpwd ne 'nouser') {
 	if($howpwd eq "internal") { # Encrypted is in local password file.
-	    $validated = (crypt($password, $contentpwd) eq $contentpwd);
+            if (length($contentpwd) == 13) {
+                $validated = (crypt($password,$contentpwd) eq $contentpwd);
+                if ($validated) {
+                    my $ncpass = &hash_passwd($domain,$password);
+                    if (&rewrite_password_file($domain,$user,"$howpwd:$ncpass")) {
+                        &update_passwd_history($user,$domain,$howpwd,'conversion');
+                        &logthis("Validated password hashed with bcrypt for $user:$domain");
+                    }
+                }
+            } else {
+                $validated = &check_internal_passwd($password,$contentpwd,$domain);
+            }
 	}
 	elsif ($howpwd eq "unix") { # User is a normal unix user.
 	    $contentpwd = (getpwnam($user))[1];
@@ -6623,54 +7245,24 @@ sub validate_user {
 	    } else {
 		$validated = 0;
 	    }
-	}
-	elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
-	    if(! ($password =~ /$null/) ) {
-		my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
-							   "",
-							   $contentpwd,,
-							   'krbtgt',
-							   $contentpwd,
-							   1,
-							   $password);
-		if(!$k4error) {
-		    $validated = 1;
-		} else {
-		    $validated = 0;
-		    &logthis('krb4: '.$user.', '.$contentpwd.', '.
-			     &Authen::Krb4::get_err_txt($Authen::Krb4::error));
-		}
-	    } else {
-		$validated = 0; # Password has a match with null.
-	    }
+	} elsif ($howpwd eq "krb4") { # user is in kerberos 4 auth. domain.
+            my $checkwithkrb5 = 0;
+            if ($dist =~/^fedora(\d+)$/) {
+                if ($1 > 11) {
+                    $checkwithkrb5 = 1;
+                }
+            } elsif ($dist =~ /^suse([\d.]+)$/) {
+                if ($1 > 11.1) {
+                    $checkwithkrb5 = 1; 
+                }
+            }
+            if ($checkwithkrb5) {
+                $validated = &krb5_authen($password,$null,$user,$contentpwd);
+            } else {
+                $validated = &krb4_authen($password,$null,$user,$contentpwd);
+            }
 	} elsif ($howpwd eq "krb5") { # User is in kerberos 5 auth. domain.
-	    if(!($password =~ /$null/)) { # Null password not allowed.
-		my $krbclient = &Authen::Krb5::parse_name($user.'@'
-							  .$contentpwd);
-		my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
-		my $krbserver  = &Authen::Krb5::parse_name($krbservice);
-		my $credentials= &Authen::Krb5::cc_default();
-		$credentials->initialize(&Authen::Krb5::parse_name($user.'@'
-                                                                 .$contentpwd));
-                my $krbreturn;
-                if (exists(&Authen::Krb5::get_init_creds_password)) {
-                    $krbreturn = 
-                        &Authen::Krb5::get_init_creds_password($krbclient,$password,
-                                                               $krbservice);
-                    $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
-                } else {
-		    $krbreturn  = 
-                        &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
-		 						$password,$credentials);
-		    $validated = ($krbreturn == 1);
-                }
-		if (!$validated) {
-		    &logthis('krb5: '.$user.', '.$contentpwd.', '.
-			     &Authen::Krb5::error());
-		}
-	    } else {
-		$validated = 0;
-	    }
+            $validated = &krb5_authen($password,$null,$user,$contentpwd);
 	} elsif ($howpwd eq "localauth") { 
 	    #  Authenticate via installation specific authentcation method:
 	    $validated = &localauth::localauth($user, 
@@ -6701,6 +7293,98 @@ sub validate_user {
     return $validated;
 }
 
+sub check_internal_passwd {
+    my ($plainpass,$stored,$domain) = @_;
+    my (undef,$method,@rest) = split(/!/,$stored);
+    if ($method eq "bcrypt") {
+        my $result = &hash_passwd($domain,$plainpass,@rest);
+        if ($result ne $stored) {
+            return 0;
+        }
+        # Upgrade to a larger number of rounds if necessary
+        my $defaultcost;
+        my %domconfig =
+            &Apache::lonnet::get_dom('configuration',['password'],$domain);
+        if (ref($domconfig{'password'}) eq 'HASH') {
+            $defaultcost = $domconfig{'password'}{'cost'};
+        }
+        if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
+            $defaultcost = 10;
+        }
+        return 1 unless($rest[0]<$defaultcost);
+    }
+    return 0;
+}
+
+sub get_last_authchg {
+    my ($domain,$user) = @_;
+    my $lastmod;
+    my $logname = &propath($domain,$user).'/passwd.log';
+    if (-e "$logname") {
+        $lastmod = (stat("$logname"))[9];
+    }
+    return $lastmod;
+}
+
+sub krb4_authen {
+    my ($password,$null,$user,$contentpwd) = @_;
+    my $validated = 0;
+    if (!($password =~ /$null/) ) {  # Null password not allowed.
+        eval {
+            require Authen::Krb4;
+        };
+        if (!$@) {
+            my $k4error = &Authen::Krb4::get_pw_in_tkt($user,
+                                                       "",
+                                                       $contentpwd,,
+                                                       'krbtgt',
+                                                       $contentpwd,
+                                                       1,
+                                                       $password);
+            if(!$k4error) {
+                $validated = 1;
+            } else {
+                $validated = 0;
+                &logthis('krb4: '.$user.', '.$contentpwd.', '.
+                          &Authen::Krb4::get_err_txt($Authen::Krb4::error));
+            }
+        } else {
+            $validated = krb5_authen($password,$null,$user,$contentpwd);
+        }
+    }
+    return $validated;
+}
+
+sub krb5_authen {
+    my ($password,$null,$user,$contentpwd) = @_;
+    my $validated = 0;
+    if(!($password =~ /$null/)) { # Null password not allowed.
+        my $krbclient = &Authen::Krb5::parse_name($user.'@'
+                                                  .$contentpwd);
+        my $krbservice = "krbtgt/".$contentpwd."\@".$contentpwd;
+        my $krbserver  = &Authen::Krb5::parse_name($krbservice);
+        my $credentials= &Authen::Krb5::cc_default();
+        $credentials->initialize(&Authen::Krb5::parse_name($user.'@'
+                                                            .$contentpwd));
+        my $krbreturn;
+        if (exists(&Authen::Krb5::get_init_creds_password)) {
+            $krbreturn =
+                &Authen::Krb5::get_init_creds_password($krbclient,$password,
+                                                          $krbservice);
+            $validated = (ref($krbreturn) eq 'Authen::Krb5::Creds');
+        } else {
+            $krbreturn  =
+                &Authen::Krb5::get_in_tkt_with_password($krbclient,$krbserver,
+                                                         $password,$credentials);
+            $validated = ($krbreturn == 1);
+        }
+        if (!$validated) {
+            &logthis('krb5: '.$user.', '.$contentpwd.', '.
+                     &Authen::Krb5::error());
+        }
+    }
+    return $validated;
+}
 
 sub addline {
     my ($fname,$hostid,$ip,$newline)=@_;
@@ -6913,7 +7597,9 @@ sub subscribe {
                 # the metadata
 		unless ($fname=~/\.meta$/) { &unsub("$fname.meta",$clientip); }
 		$fname=~s/\/home\/httpd\/html\/res/raw/;
-		$fname="http://".&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
+                my $protocol = $Apache::lonnet::protocol{$perlvar{'lonHostID'}};
+                $protocol = 'http' if ($protocol ne 'https');
+		$fname=$protocol.'://'.&Apache::lonnet::hostname($perlvar{'lonHostID'})."/".$fname;
 		$result="$fname\n";
 	    }
 	} else {
@@ -6955,26 +7641,26 @@ sub change_unix_password {
 
 
 sub make_passwd_file {
-    my ($uname, $umode,$npass,$passfilename)=@_;
+    my ($uname,$udom,$umode,$npass,$passfilename,$action)=@_;
     my $result="ok";
     if ($umode eq 'krb4' or $umode eq 'krb5') {
 	{
 	    my $pf = IO::File->new(">$passfilename");
 	    if ($pf) {
 		print $pf "$umode:$npass\n";
+                &update_passwd_history($uname,$udom,$umode,$action);
 	    } else {
 		$result = "pass_file_failed_error";
 	    }
 	}
     } elsif ($umode eq 'internal') {
-	my $salt=time;
-	$salt=substr($salt,6,2);
-	my $ncpass=crypt($npass,$salt);
+        my $ncpass = &hash_passwd($udom,$npass);
 	{
 	    &Debug("Creating internal auth");
 	    my $pf = IO::File->new(">$passfilename");
 	    if($pf) {
-		print $pf "internal:$ncpass\n"; 
+		print $pf "internal:$ncpass\n";
+                &update_passwd_history($uname,$udom,$umode,$action); 
 	    } else {
 		$result = "pass_file_failed_error";
 	    }
@@ -6989,55 +7675,8 @@ sub make_passwd_file {
 	    }
 	}
     } elsif ($umode eq 'unix') {
-	{
-	    #
-	    #  Don't allow the creation of privileged accounts!!! that would
-	    #  be real bad!!!
-	    #
-	    my $uid = getpwnam($uname);
-	    if((defined $uid) && ($uid == 0)) {
-		&logthis(">>>Attempted to create privilged account blocked");
-		return "no_priv_account_error\n";
-	    }
-
-	    my $execpath       ="$perlvar{'lonDaemons'}/"."lcuseradd";
-
-	    my $lc_error_file  = $execdir."/tmp/lcuseradd".$$.".status";
-	    {
-		&Debug("Executing external: ".$execpath);
-		&Debug("user  = ".$uname.", Password =". $npass);
-		my $se = IO::File->new("|$execpath > $perlvar{'lonDaemons'}/logs/lcuseradd.log");
-		print $se "$uname\n";
-		print $se "$npass\n";
-		print $se "$npass\n";
-		print $se "$lc_error_file\n"; # Status -> unique file.
-	    }
-	    if (-r $lc_error_file) {
-		&Debug("Opening error file: $lc_error_file");
-		my $error = IO::File->new("< $lc_error_file");
-		my $useraddok = <$error>;
-		$error->close;
-		unlink($lc_error_file);
-		
-		chomp $useraddok;
-	
-		if($useraddok > 0) {
-		    my $error_text = &lcuseraddstrerror($useraddok);
-		    &logthis("Failed lcuseradd: $error_text");
-		    $result = "lcuseradd_failed:$error_text";
-		}  else {
-		    my $pf = IO::File->new(">$passfilename");
-		    if($pf) {
-			print $pf "unix:\n";
-		    } else {
-			$result = "pass_file_failed_error";
-		    }
-		}
-	    }  else {
-		&Debug("Could not locate lcuseradd error: $lc_error_file");
-		$result="bug_lcuseradd_no_output_file";
-	    }
-	}
+	&logthis(">>>Attempt to create unix account blocked -- unix auth not available for new users.");
+	$result="no_new_unix_accounts";
     } elsif ($umode eq 'none') {
 	{
 	    my $pf = IO::File->new("> $passfilename");
@@ -7071,7 +7710,7 @@ sub sethost {
 	eq &Apache::lonnet::get_host_ip($hostid)) {
 	$currenthostid  =$hostid;
 	$currentdomainid=&Apache::lonnet::host_domain($hostid);
-	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
+#	&logthis("Setting hostid to $hostid, and domain to $currentdomainid");
     } else {
 	&logthis("Requested host id $hostid not an alias of ".
 		 $perlvar{'lonHostID'}." refusing connection");
@@ -7086,6 +7725,27 @@ sub version {
     return "version:$VERSION";
 }
 
+sub get_usersession_config {
+    my ($dom,$name) = @_;
+    my ($usersessionconf,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
+    if (defined($cached)) {
+        return $usersessionconf;
+    } else {
+        my %domconfig = &Apache::lonnet::get_dom('configuration',['usersessions'],$dom);
+        if (ref($domconfig{'usersessions'}) eq 'HASH') {
+            &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'usersessions'},3600);
+            return $domconfig{'usersessions'};
+        }
+    }
+    return;
+}
+
+
+
+
+sub distro_and_arch {
+    return $dist.':'.$arch;
+}
 
 # ----------------------------------- POD (plain old documentation, CPAN style)
 
@@ -7266,7 +7926,7 @@ Allow for a password to be set.
 
 Make a user.
 
-=item passwd
+=item changeuserauth
 
 Allow for authentication mechanism and password to be changed.
 
@@ -7294,7 +7954,7 @@ Place in B<logs/lond.log>
 
 stores hash in namespace
 
-=item rolesputy
+=item rolesput
 
 put a role into a user's environment
 
@@ -7355,6 +8015,10 @@ for each student, defined perhaps by the
 Returns usernames corresponding to IDs.  (These "IDs" are unique identifiers
 for each student, defined perhaps by the institutional Registrar.)
 
+=item iddel
+
+Deletes one or more ids in a domain's id database.
+
 =item tmpput
 
 Accept and store information in temporary space.
@@ -7411,6 +8075,8 @@ Authen::Krb5
 
 =head1 COREQUISITES
 
+none
+
 =head1 OSNAMES
 
 linux
@@ -7498,9 +8164,9 @@ or the CA's certificate in the call to l
 <error> is the textual reason this failed.  Usual reasons:
 
 =over 2
-       
+
 =item Apache config file for loncapa  incorrect:
- 
+
 one of the variables 
 lonCertificateDirectory, lonnetCertificateAuthority, or lonnetCertificate
 undefined or incorrect
@@ -7619,7 +8285,7 @@ Could not rewrite the
 internal password file for a user
 
 =item Result of password change for <user> : <result>
-                                                                     
+
 A unix password change for <user> was attempted 
 and the pipe returned <result>  
 
@@ -7648,7 +8314,7 @@ lond has been asked to exit by its clien
 client systemand <input> is the full exit command sent to the server.
 
 =item Red CRITICAL: ABNORMAL EXIT. child <pid> for server <hostname> died through a crass with this error->[<message>].
-                                                 
+
 A lond child terminated.  NOte that this termination can also occur when the
 child receives the QUIT or DIE signals.  <pid> is the process id of the child,
 <hostname> the host lond is working for, and <message> the reason the child died
@@ -7732,7 +8398,7 @@ file when sent it's USR1 signal.  That p
 assumed to be hung in some un-fixable way.
 
 =item Finished checking children                   
- 
+
 Master processs's USR1 processing is cojmplete.
 
 =item (Red) CRITICAL: ------- Starting ------            
@@ -7746,7 +8412,7 @@ Started a new child process for <client>
 connected to the child.  This was as a result of a TCP/IP connection from a client.
 
 =item Unable to determine who caller was, getpeername returned nothing
-                                                  
+
 In child process initialization.  either getpeername returned undef or
 a zero sized object was returned.  Processing continues, but in my opinion,
 this should be cause for the child to exit.
@@ -7757,7 +8423,7 @@ In child process initialization.  The pe
 The client address is stored as "Unavailable" and processing continues.
 
 =item (Yellow) INFO: Connection <ip> <name> connection type = <type>
-                                                  
+
 In child initialization.  A good connectionw as received from <ip>.
 
 =over 2
@@ -7807,7 +8473,7 @@ The client (<client> is the peer's name
 negotiated an SSL connection with this child process.
 
 =item (Green) Successful insecure authentication with <client>
-                                                   
+
 
 The client has successfully negotiated an  insecure connection withthe child process.
 
@@ -7821,5 +8487,7 @@ string.
 
 =back
 
+=back
+
 
 =cut