--- loncom/lond	2017/03/13 19:09:32	1.489.2.26
+++ loncom/lond	2017/02/07 18:14:13	1.531
@@ -2,7 +2,7 @@
 # The LearningOnline Network
 # lond "LON Daemon" Server (port "LOND" 5663)
 #
-# $Id: lond,v 1.489.2.26 2017/03/13 19:09:32 raeburn Exp $
+# $Id: lond,v 1.531 2017/02/07 18:14:13 raeburn Exp $
 #
 # Copyright Michigan State University Board of Trustees
 #
@@ -15,7 +15,6 @@
 #
 # 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.
 #
@@ -41,7 +40,7 @@ use IO::File;
 #use Apache::File;
 use POSIX;
 use Crypt::IDEA;
-use LWP::UserAgent();
+use HTTP::Request;
 use Digest::MD5 qw(md5_hex);
 use GDBM_File;
 use Authen::Krb5;
@@ -58,13 +57,14 @@ use Mail::Send;
 use Crypt::Eksblowfish::Bcrypt;
 use Digest::SHA;
 use Encode;
+use LONCAPA::LWPReq;
 
 my $DEBUG = 0;		       # Non zero to enable debug log entries.
 
 my $status='';
 my $lastlog='';
 
-my $VERSION='$Revision: 1.489.2.26 $'; #' stupid emacs
+my $VERSION='$Revision: 1.531 $'; #' stupid emacs
 my $remoteVERSION;
 my $currenthostid="default";
 my $currentdomainid;
@@ -74,8 +74,14 @@ 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 $clientintdom;               # LonCAPA "internet domain" for 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 $server;
 
 my $keymode;
@@ -145,6 +151,145 @@ my @installerrors = ("ok",
 		     );
 
 #
+# The %trust hash classifies commands according to type of trust 
+# required for execution of the command.
+#
+# When clients from a different institution request execution of a
+# particular command, the trust settings for that institution set
+# for this domain (or default domain for a multi-domain server) will
+# be checked to see if running the command is allowed.
+#
+# Trust types which depend on the "Trust" domain configuration
+# for the machine's default domain are:
+#
+# content   ("Access to this domain's content by others")
+# 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")
+# 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")
+# msg       ("Users in other domains can send messages to this domain")
+# 
+# Trust type which depends on the User Session Hosting (remote) 
+# domain configuration for machine's default domain is: "remote".
+#
+# Trust types which depend on contents of manager.tab in 
+# /home/httpd/lonTabs is: "manageronly".
+# 
+# Trust type which requires client to share the same LON-CAPA
+# "internet domain" (i.e., same institution as this server) is:
+# "institutiononly".
+#
+
+my %trust = (
+               auth => {remote => 1},
+               autocreatepassword => {remote => 1},
+               autocrsreqchecks => {remote => 1, reqcrs => 1},
+               autocrsrequpdate => {remote => 1},
+               autocrsreqvalidation => {remote => 1},
+               autogetsections => {remote => 1},
+               autoinstcodedefaults => {remote => 1, catalog => 1},
+               autoinstcodeformat => {remote => 1, catalog => 1},
+               autonewcourse => {remote => 1, reqcrs => 1},
+               autophotocheck => {remote => 1, enroll => 1},
+               autophotochoice => {remote => 1},
+               autophotopermission => {remote => 1, enroll => 1},
+               autopossibleinstcodes => {remote => 1, reqcrs => 1},
+               autoretrieve => {remote => 1, enroll => 1, catalog => 1},
+               autorun => {remote => 1, enroll => 1, reqcrs => 1},
+               autovalidateclass_sec => {catalog => 1},
+               autovalidatecourse => {remote => 1, enroll => 1},
+               autovalidateinstcode => {domroles => 1, remote => 1, enroll => 1},
+               changeuserauth => {remote => 1, domroles => 1},
+               chatretr => {remote => 1, enroll => 1},
+               chatsend => {remote => 1, enroll => 1},
+               courseiddump => {remote => 1, domroles => 1, enroll => 1},
+               courseidput => {remote => 1, domroles => 1, enroll => 1},
+               courseidputhash => {remote => 1, domroles => 1, enroll => 1},
+               courselastaccess => {remote => 1, domroles => 1, enroll => 1},
+               currentauth => {remote => 1, domroles => 1, enroll => 1},
+               currentdump => {remote => 1, enroll => 1},
+               currentversion => {remote=> 1, content => 1},
+               dcmaildump => {remote => 1, domroles => 1},
+               dcmailput => {remote => 1, domroles => 1},
+               del => {remote => 1, domroles => 1, enroll => 1, content => 1},
+               deldom => {remote => 1, domroles => 1}, # not currently used
+               devalidatecache => {institutiononly => 1},
+               domroleput => {remote => 1, enroll => 1},
+               domrolesdump => {remote => 1, catalog => 1},
+               du => {remote => 1, enroll => 1},
+               du2 => {remote => 1, enroll => 1},
+               dump => {remote => 1, enroll => 1, domroles => 1},
+               edit => {institutiononly => 1},  #not used currently
+               eget => {remote => 1, domroles => 1, enroll => 1}, #not used currently
+               ekey => {}, #not used currently
+               exit => {anywhere => 1},
+               fetchuserfile => {remote => 1, enroll => 1},
+               get => {remote => 1, domroles => 1, enroll => 1},
+               getdom => {anywhere => 1},
+               home => {anywhere => 1},
+               iddel => {remote => 1, enroll => 1},
+               idget => {remote => 1, enroll => 1},
+               idput => {remote => 1, domroles => 1, enroll => 1},
+               inc => {remote => 1, enroll => 1},
+               init => {anywhere => 1},
+               inst_usertypes => {remote => 1, domroles => 1, enroll => 1},
+               instemailrules => {remote => 1, domroles => 1},
+               instidrulecheck => {remote => 1, domroles => 1,},
+               instidrules => {remote => 1, domroles => 1,},
+               instrulecheck => {remote => 1, enroll => 1, reqcrs => 1, domroles => 1},
+               instselfcreatecheck => {institutiononly => 1},
+               instuserrules => {remote => 1, enroll => 1, reqcrs => 1, domroles => 1},
+               keys => {remote => 1,},
+               load => {anywhere => 1},
+               log => {anywhere => 1},
+               ls => {remote => 1, enroll => 1, content => 1,},
+               ls2 => {remote => 1, enroll => 1, content => 1,},
+               ls3 => {remote => 1, enroll => 1, content => 1,},
+               makeuser => {remote => 1, enroll => 1, domroles => 1,},
+               mkdiruserfile => {remote => 1, enroll => 1,},
+               newput => {remote => 1, enroll => 1, reqcrs => 1, domroles => 1,},
+               passwd => {remote => 1},
+               ping => {anywhere => 1},
+               pong => {anywhere => 1},
+               pushfile => {manageronly => 1},
+               put => {remote => 1, enroll => 1, domroles => 1, msg => 1, content => 1, shared => 1},
+               putdom => {remote => 1, domroles => 1,},
+               putstore => {remote => 1, enroll => 1},
+               queryreply => {anywhere => 1},
+               querysend => {anywhere => 1},
+               quit => {anywhere => 1},
+               readlonnetglobal => {institutiononly => 1},
+               reinit => {manageronly => 1}, #not used currently
+               removeuserfile => {remote => 1, enroll => 1},
+               renameuserfile => {remote => 1,},
+               restore => {remote => 1, enroll => 1, reqcrs => 1,},
+               rolesdel => {remote => 1, enroll => 1, domroles => 1, coaurem => 1},
+               rolesput => {remote => 1, enroll => 1, domroles => 1, coaurem => 1},
+               servercerts => {institutiononly => 1},
+               serverdistarch => {anywhere => 1},
+               serverhomeID => {anywhere => 1},
+               serverloncaparev => {anywhere => 1},
+               servertimezone => {remote => 1, enroll => 1},
+               setannounce => {remote => 1, domroles => 1},
+               sethost => {anywhere => 1},
+               store => {remote => 1, enroll => 1, reqcrs => 1,},
+               studentphoto => {remote => 1, enroll => 1},
+               sub => {content => 1,},
+               tmpdel => {anywhere => 1},
+               tmpget => {anywhere => 1},
+               tmpput => {anywhere => 1},
+               tokenauthuserfile => {anywhere => 1},
+               unsub => {content => 1,},
+               update => {shared => 1},
+               updateclickers => {remote => 1},
+               userhassession => {anywhere => 1},
+               userload => {anywhere => 1},
+               version => {anywhere => 1}, #not used
+            );
+
+#
 #   Statistics that are maintained and dislayed in the status line.
 #
 my $Transactions = 0;		# Number of attempted transactions.
@@ -667,10 +812,8 @@ sub PushFile {
                 $clientprotocol = 'http' if ($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);
+                my $response = LONCAPA::LWPReq::makerequest($clientname,$request,'',\%perlvar,60,0);
                 if ($response->is_error()) {
                     &logthis('<font color="red"> Pushfile: unable to install '
                             .$tablefile." - error attempting to pull data. </font>");
@@ -1758,15 +1901,17 @@ sub read_lonnet_global {
                       );
     my %limit_to = (
                     perlvar => {
-                                 lonOtherAuthen => 1,
-                                 lonBalancer    => 1,
-                                 lonVersion     => 1,
-                                 lonSysEMail    => 1,
-                                 lonHostID      => 1,
-                                 lonRole        => 1,
-                                 lonDefDomain   => 1,
-                                 lonLoadLim     => 1,
-                                 lonUserLoadLim => 1,
+                                 lonOtherAuthen  => 1,
+                                 lonBalancer     => 1,
+                                 lonVersion      => 1,
+                                 lonAdmEMail     => 1,
+                                 lonSupportEMail => 1,  
+                                 lonSysEMail     => 1,
+                                 lonHostID       => 1,
+                                 lonRole         => 1,
+                                 lonDefDomain    => 1,
+                                 lonLoadLim      => 1,
+                                 lonUserLoadLim  => 1,
                                }
                   );
     if (ref($requested) eq 'HASH') {
@@ -1878,6 +2023,16 @@ sub server_distarch_handler {
 }
 &register_handler("serverdistarch", \&server_distarch_handler, 0, 1, 0);
 
+sub server_certs_handler {
+    my ($cmd,$tail,$client) = @_;
+    my $userinput = "$cmd:$tail";
+    my $result;
+    my $result = &LONCAPA::Lond::server_certs(\%perlvar);
+    &Reply($client,\$result,$userinput);
+    return;
+}
+&register_handler("servercerts", \&server_certs_handler, 0, 1, 0);
+
 #   Process a reinit request.  Reinit requests that either
 #   lonc or lond be reinitialized so that an updated 
 #   host.tab or domain.tab can be processed.
@@ -2010,18 +2165,14 @@ sub authenticate_handler {
                 my ($remote,$hosted);
                 my $remotesession = &get_usersession_config($udom,'remotesession');
                 if (ref($remotesession) eq 'HASH') {
-                    $remote = $remotesession->{'remote'}
+                    $remote = $remotesession->{'remote'};
                 }
                 my $hostedsession = &get_usersession_config($clienthomedom,'hostedsession');
                 if (ref($hostedsession) eq 'HASH') {
                     $hosted = $hostedsession->{'hosted'};
                 }
-                my $loncaparev = $clientversion;
-                if ($loncaparev eq '') {
-                    $loncaparev = $Apache::lonnet::loncaparevs{$clientname};
-                }
                 $canhost = &Apache::lonnet::can_host_session($udom,$clientname,
-                                                             $loncaparev,
+                                                             $clientversion,
                                                              $remote,$hosted);
             }
         }
@@ -2119,7 +2270,7 @@ sub change_password_handler {
 	    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);
@@ -2151,8 +2302,12 @@ sub hash_passwd {
         my $plainsalt = substr($rest[1],0,22);
         $salt = Crypt::Eksblowfish::Bcrypt::de_base64($plainsalt);
     } else {
-        my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
-        my $defaultcost = $domdefaults{'intauth_cost'};
+        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 {
@@ -2287,7 +2442,7 @@ sub change_authentication_handler {
 		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');
+                    &update_passwd_history($uname,$udom,$umode,'changeuserauth'); 
 		    &Reply($client, \$result);
 		} else {
 		    &Failure($client, \$result);
@@ -2412,9 +2567,8 @@ sub update_resource_handler {
 # FIXME: this should use the LWP mechanism, not internal alarms.
                 alarm(1200);
 		{
-		    my $ua=new LWP::UserAgent;
 		    my $request=new HTTP::Request('GET',"$remoteurl");
-		    $response=$ua->request($request,$transname);
+                    $response=&LONCAPA::LWPReq::makerequest($clientname,$request,$transname,\%perlvar,1200,0,1);
 		}
 		alarm(0);
 		if ($response->is_error()) {
@@ -2427,9 +2581,8 @@ sub update_resource_handler {
 # FIXME: isn't there an internal LWP mechanism for this?
 			alarm(120);
 			{
-			    my $ua=new LWP::UserAgent;
 			    my $mrequest=new HTTP::Request('GET',$remoteurl.'.meta');
-			    my $mresponse=$ua->request($mrequest,$fname.'.meta');
+                            my $mresponse = &LONCAPA::LWPReq::makerequest($clientname,$mrequest,$fname.'.meta',\%perlvar,120,0,1);
 			    if ($mresponse->is_error()) {
 				unlink($fname.'.meta');
 			    }
@@ -2504,11 +2657,15 @@ sub fetch_user_file_handler {
 	my $remoteurl=$clientprotocol.'://'.$clienthost.'/userfiles/'.$fname;
 	my $response;
 	Debug("Remote URL : $remoteurl Transfername $transname Destname: $destname");
-	alarm(120);
+	alarm(1200);
 	{
-	    my $ua=new LWP::UserAgent;
 	    my $request=new HTTP::Request('GET',"$remoteurl");
-	    $response=$ua->request($request,$transname);
+            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,$verifycert);
 	}
 	alarm(0);
 	if ($response->is_error()) {
@@ -2577,13 +2734,13 @@ 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 appropriate
-	        #   Note: rmdir will only remove an empty directory.
+		#   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
+                    # 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 = $1;
@@ -2957,8 +3114,8 @@ sub newput_user_profile_entry {
                 &logthis("error: ".($!+0)." untie (GDBM) failed ".
                          "while attempting newput - early out as key exists");
             }
-	    &Failure($client, "key_exists: ".$key."\n",$userinput);
-	    return 1;
+            &Failure($client, "key_exists: ".$key."\n",$userinput);
+            return 1;
 	}
     }
 
@@ -3360,6 +3517,17 @@ 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);
@@ -3439,11 +3607,11 @@ sub dump_with_regexp {
     my ($cmd, $tail, $client) = @_;
 
     my $res = LONCAPA::Lond::dump_with_regexp($tail, $clientversion);
-
+    
     if ($res =~ /^error:/) {
-        &Failure($client, \$res, "$cmd:$tail");
+        Failure($client, \$res, "$cmd:$tail");
     } else {
-        &Reply($client, \$res, "$cmd:$tail");
+        Reply($client, \$res, "$cmd:$tail");
     }
 
     return 1;
@@ -3481,7 +3649,6 @@ sub store_handler {
     my ($cmd, $tail, $client) = @_;
  
     my $userinput = "$cmd:$tail";
-
     chomp($tail);
     my ($udom,$uname,$namespace,$rid,$what,$laststore) =split(/:/,$tail);
     if ($namespace ne 'roles') {
@@ -3511,7 +3678,6 @@ sub store_handler {
                     $numtrans =~ s/D//g;
                 }
             }
-
 	    $hashref->{"version:$rid"}++;
 	    my $version=$hashref->{"version:$rid"};
 	    my $allkeys=''; 
@@ -3528,7 +3694,7 @@ sub store_handler {
                 if ($numtrans) {
                     $msg = 'delay:'.$numtrans;
                 }
-                &Reply($client, "$msg\n", $userinput);
+		&Reply($client, "$msg\n", $userinput);
 	    } else {
 		&Failure($client, "error: ".($!+0)." untie(GDBM) Failed ".
 			"while attempting store\n", $userinput);
@@ -4045,7 +4211,7 @@ sub put_course_id_hash_handler {
 #
 #                 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
+#                 hasuniquecode - filter by courses for which a six character unique code has 
 #                                 been set.
 #
 #     $client  - The socket open on the client.
@@ -4055,6 +4221,17 @@ 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,
@@ -4502,6 +4679,122 @@ 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.
@@ -4661,7 +4954,7 @@ sub get_id_handler {
 # Returns:
 #     1   - Continue processing
 #     0   - Exit server.
-#
+#     
 #
 
 sub del_id_handler {
@@ -5452,7 +5745,6 @@ sub auto_export_grades_handler {
 &register_handler("autoexportgrades", \&auto_export_grades_handler,
                   0, 1, 0);
 
-
 #   Retrieve and remove temporary files created by/during autoenrollment.
 #
 # Formal Parameters:
@@ -5473,6 +5765,7 @@ sub retrieve_auto_file_handler {
     my ($filename)   = split(/:/, $tail);
 
     my $source = $perlvar{'lonDaemons'}.'/tmp/'.$filename;
+
     if ($filename =~m{/\.\./}) {
         &Failure($client, "refused\n", $userinput);
     } elsif ($filename !~ /^$LONCAPA::match_domain\_$LONCAPA::match_courseid\_.+_classlist\.xml$/) {
@@ -5509,7 +5802,7 @@ sub crsreq_checks_handler {
     my $userinput = "$cmd:$tail";
     my $dom = $tail;
     my $result;
-    my @reqtypes = ('official','unofficial','community','textbook');
+    my @reqtypes = ('official','unofficial','community','textbook','placement');
     eval {
         local($SIG{__DIE__})='DEFAULT';
         my %validations;
@@ -6114,12 +6407,13 @@ sub get_request {
 #
 # Parameters:
 #    user_input   - The request received from the client (lonc).
+#
 # Returns:
 #    true to keep processing, false if caller should exit.
 #
 sub process_request {
-    my ($userinput) = @_;      # Easier for now to break style than to
-                                # fix all the userinput -> user_input.
+    my ($userinput) = @_; # Easier for now to break style than to
+                          # fix all the userinput -> user_input.
     my $wasenc    = 0;		# True if request was encrypted.
 # ------------------------------------------------------------ See if encrypted
     # for command
@@ -6199,6 +6493,49 @@ sub process_request {
 	    Debug("Client not privileged to do this operation");
 	    $ok = 0;
 	}
+        if ($ok) {
+            if (ref($trust{$command}) eq 'HASH') {
+                my $donechecks;
+                if ($trust{$command}{'anywhere'}) {
+                   $donechecks = 1;
+                } elsif ($trust{$command}{'manageronly'}) {
+                    unless (&isManager()) {
+                        $ok = 0;
+                    }
+                    $donechecks = 1;
+                } elsif ($trust{$command}{'institutiononly'}) {
+                    unless ($clientsameinst) {
+                        $ok = 0;
+                    }
+                    $donechecks = 1;
+                } elsif ($clientsameinst) {
+                    $donechecks = 1;
+                }
+                unless ($donechecks) {
+                    foreach my $rule (keys(%{$trust{$command}})) {
+                        next if ($rule eq 'remote');
+                        if ($trust{$command}{$rule}) {
+                            if ($clientprohibited{$rule}) {
+                                $ok = 0;
+                            } else {
+                                $ok = 1;
+                                $donechecks = 1;
+                                last;
+                            }
+                        }
+                    }
+                }
+                unless ($donechecks) {
+                    if ($trust{$command}{'remote'}) {
+                        if ($clientremoteok) {
+                            $ok = 1;
+                        } else {
+                            $ok = 0;
+                        } 
+                    }
+                }
+            }
+        }
 
 	if($ok) {
 	    Debug("Dispatching to handler $command $tail");
@@ -6209,8 +6546,7 @@ sub process_request {
 	    Failure($client, "refused\n", $userinput);
 	    return 1;
 	}
-
-    }    
+    }
 
     print $client "unknown_cmd\n";
 # -------------------------------------------------------------------- complete
@@ -6554,6 +6890,9 @@ 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)) {
@@ -6807,7 +7146,7 @@ sub make_new_child {
             }
         } elsif ($dist =~ /^suse(\d+\.\d+)$/) {
             if (($1 eq '9.3') || ($1 >= 12.2)) {
-                $no_ets = 1;
+                $no_ets = 1; 
             }
         } elsif ($dist =~ /^sles(\d+)$/) {
             if ($1 > 11) {
@@ -6819,8 +7158,8 @@ sub make_new_child {
             }
         }
         unless ($no_ets) {
-            &Authen::Krb5::init_ets();
-        }
+	    &Authen::Krb5::init_ets();
+	}
 
 	&status('Accepted connection');
 # =============================================================================
@@ -6864,12 +7203,12 @@ sub make_new_child {
 		#  If the remote is attempting a local init... give that a try:
 		#
 		(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};
+        # 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 
@@ -6934,6 +7273,7 @@ sub make_new_child {
 				  ."Attempted insecure connection disallowed </font>");
 			close $client;
 			$clientok = 0;
+			
 		    }
 		}
 	    } else {
@@ -6942,6 +7282,7 @@ sub make_new_child {
 			 ."$clientip failed to initialize: >$remotereq< </font>");
 		&status('No init '.$clientip);
 	    }
+	    
 	} else {
 	    &logthis(
 		     "<font color='blue'>WARNING: Unknown client $clientip</font>");
@@ -6962,6 +7303,41 @@ sub make_new_child {
             my $clienthost = &Apache::lonnet::hostname($clientname);
             my $clientserverhomeID = &Apache::lonnet::get_server_homeID($clienthost);
             $clienthomedom = &Apache::lonnet::host_domain($clientserverhomeID);
+            $clientintdom = &Apache::lonnet::internet_dom($clientserverhomeID);
+            $clientsameinst = 0;
+            if ($clientintdom ne '') {
+                my $internet_names = &Apache::lonnet::get_internet_names($currenthostid);
+                if (ref($internet_names) eq 'ARRAY') {
+                    if (grep(/^\Q$clientintdom\E$/,@{$internet_names})) {
+                        $clientsameinst = 1;
+                    }
+                }
+            }
+            $clientremoteok = 0;
+            unless ($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");
@@ -6977,7 +7353,7 @@ sub make_new_child {
 	    &logthis("<font color='blue'>WARNING: "
 		     ."Rejected client $clientip, closing connection</font>");
 	}
-    }            
+    }
     
 # =============================================================================
     
@@ -7099,25 +7475,15 @@ sub password_filename {
 #    domain    - domain of the user.
 #    name      - User's name.
 #    contents  - New contents of the file.
-#    saveold   - (optional). If true save old file in a passwd.bak file.
 # Returns:
 #   0    - Failed.
 #   1    - Success.
 #
 sub rewrite_password_file {
-    my ($domain, $user, $contents, $saveold) = @_;
+    my ($domain, $user, $contents) = @_;
 
     my $file = &password_filename($domain, $user);
     if (defined $file) {
-        if ($saveold) {
-            my $bakfile = $file.'.bak';
-            if (CopyFile($file,$bakfile)) {
-                chmod(0400,$bakfile);
-                &logthis("Old password saved in passwd.bak for internally authenticated user: $user:$domain");
-            } else {
-                &logthis("Failed to save old password in passwd.bak for internally authenticated user: $user:$domain");
-            }
-        }
 	my $pf = IO::File->new(">$file");
 	if($pf) {
 	    print $pf "$contents\n";
@@ -7208,27 +7574,20 @@ sub validate_user {
                 $contentpwd = $domdefaults{'auth_arg_def'}; 
             }
         }
-    }
+    } 
     if ($howpwd ne 'nouser') {
 	if($howpwd eq "internal") { # Encrypted is in local password file.
             if (length($contentpwd) == 13) {
                 $validated = (crypt($password,$contentpwd) eq $contentpwd);
                 if ($validated) {
-                    my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
-                    if ($domdefaults{'intauth_switch'}) {
-                        my $ncpass = &hash_passwd($domain,$password);
-                        my $saveold;
-                        if ($domdefaults{'intauth_switch'} == 2) {
-                            $saveold = 1;
-                        }
-                        if (&rewrite_password_file($domain,$user,"$howpwd:$ncpass",$saveold)) {
-                            &update_passwd_history($user,$domain,$howpwd,'conversion');
-                            &logthis("Validated password hashed with bcrypt for $user:$domain");
-                        }
+                    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,$user);
+                $validated = &check_internal_passwd($password,$contentpwd,$domain);
             }
 	}
 	elsif ($howpwd eq "unix") { # User is a normal unix user.
@@ -7298,35 +7657,24 @@ sub validate_user {
 }
 
 sub check_internal_passwd {
-    my ($plainpass,$stored,$domain,$user) = @_;
+    my ($plainpass,$stored,$domain) = @_;
     my (undef,$method,@rest) = split(/!/,$stored);
-    if ($method eq 'bcrypt') {
+    if ($method eq "bcrypt") {
         my $result = &hash_passwd($domain,$plainpass,@rest);
         if ($result ne $stored) {
             return 0;
         }
-        my %domdefaults = &Apache::lonnet::get_domain_defaults($domain);
-        if ($domdefaults{'intauth_check'}) {
-            # Upgrade to a larger number of rounds if necessary
-            my $defaultcost = $domdefaults{'intauth_cost'};
-            if (($defaultcost eq '') || ($defaultcost =~ /D/)) {
-                $defaultcost = 10;
-            }
-            if (int($rest[0])<int($defaultcost)) {
-                if ($domdefaults{'intauth_check'} == 1) {
-                    my $ncpass = &hash_passwd($domain,$plainpass);
-                    if (&rewrite_password_file($domain,$user,"internal:$ncpass")) {
-                        &update_passwd_history($user,$domain,'internal','update cost');
-                        &logthis("Validated password hashed with bcrypt for $user:$domain");
-                    }
-                    return 1;
-                } elsif ($domdefaults{'intauth_check'} == 2) {
-                    return 0;
-                }
-            }
-        } else {
-            return 1;
+        # 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;
 }
@@ -7674,8 +8022,8 @@ sub make_passwd_file {
 	    &Debug("Creating internal auth");
 	    my $pf = IO::File->new(">$passfilename");
 	    if($pf) {
-		print $pf "internal:$ncpass\n"; 
-                &update_passwd_history($uname,$udom,$umode,$action);
+		print $pf "internal:$ncpass\n";
+                &update_passwd_history($uname,$udom,$umode,$action); 
 	    } else {
 		$result = "pass_file_failed_error";
 	    }
@@ -7748,14 +8096,46 @@ sub get_usersession_config {
         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 $domconfig{'usersessions'};
-        }
+        &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'usersessions'},3600);
+        return $domconfig{'usersessions'};
     }
     return;
 }
 
+sub get_prohibited {
+    my ($dom) = @_;
+    my $name = 'trust';
+    my ($trustconfig,$cached)=&Apache::lonnet::is_cached_new($name,$dom);
+    unless (defined($cached)) {
+        my %domconfig = &Apache::lonnet::get_dom('configuration',['trust'],$dom);
+        &Apache::lonnet::do_cache_new($name,$dom,$domconfig{'trust'},3600);
+        $trustconfig = $domconfig{'trust'};
+    }
+    my %prohibited;
+    if (ref($trustconfig)) {
+        foreach my $prefix (keys(%{$trustconfig})) {
+            if (ref($trustconfig->{$prefix}) eq 'HASH') {
+                my $reject;
+                if (ref($trustconfig->{$prefix}->{'exc'}) eq 'ARRAY') {
+                    if (grep(/^\Q$clientintdom\E$/,@{$trustconfig->{$prefix}->{'exc'}})) {
+                        $reject = 1;
+                    }
+                }
+                if (ref($trustconfig->{$prefix}->{'inc'}) eq 'ARRAY') {
+                    if (grep(/^\Q$clientintdom\E$/,@{$trustconfig->{$prefix}->{'inc'}})) {
+                        $reject = 0;
+                    } else {
+                        $reject = 1;
+                    }
+                }
+                if ($reject) {
+                    $prohibited{$prefix} = 1;
+                }
+            }
+        }
+    }
+    return %prohibited;
+}
 
 sub distro_and_arch {
     return $dist.':'.$arch;
@@ -7940,7 +8320,7 @@ Allow for a password to be set.
 
 Make a user.
 
-=item passwd
+=item changeuserauth
 
 Allow for authentication mechanism and password to be changed.
 
@@ -8029,6 +8409,10 @@ 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.
@@ -8085,6 +8469,8 @@ Authen::Krb5
 
 =head1 COREQUISITES
 
+none
+
 =head1 OSNAMES
 
 linux
@@ -8172,9 +8558,9 @@ 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
@@ -8293,7 +8679,7 @@ 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>  
 
@@ -8322,7 +8708,7 @@ 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
@@ -8406,7 +8792,7 @@ 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 ------            
@@ -8420,7 +8806,7 @@ 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.
@@ -8431,7 +8817,7 @@ 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
@@ -8481,7 +8867,7 @@ 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.